Idealist drew their inspiration from liberal school of
thought. They are sometimes referred to as liberal idealists. After World War
1, they became known simple as ‘idealists”. 
Idealism assumes that people were by nature not sinful or wicked, but
that harmful behaviour was the result of structural arrangement motivating
individual to act.10
The basic assumption of realism after the world war
includes: `
a.       War is an international problem requiring collective
or multi-lateral rather than national efforts to contain.
b.       War is not inevitable and its frequency can be
reduced  by eradicating the
institutional  arrangement  that encourage it.
c.        Violence is the
result of evil institutions which make people to act in selfish manner 
d.       Human nature is essentially “good” or altruistic.
e.       International society must strive to eliminate
institution that   promotes war. 
f.       
States must
reform political/democratic institution/framework to smoothen relations among
states.
It must be emphasized, however, that in as much as all
idealists share a naturalistic optimism and universalistic image of
international society, not all idealist believe fully in each of the above
assumptions.
Idealist attitude towards international society differ
significantly and these differences can be seen in three different strands.
First, they subscribe to creating international institution to defend the
weaker ones. Idealists sought to create a new world order based on collective
security. This is aimed at collective attack on the aggressor.
The second group places emphasis on legal framework
like mediation, arbitration and conciliation of settle disputes. In addition,
the legal process stipulates measures to prevent war. This category of
idealists worked towards the creation of permanent court of international
justice in 1921 to adjudicate on international conflicts. In the same vein, the
Brain Kellog Pact of 1928 outlawed war as an instrument of foreign policy.
The third group believes in development of the state
with funds which would have been channeled into war. (Swords into
plowshare).  They worked towards securing
disarmament and arms control agreements. In the main, idealists encourage
global cooperation though international law, institution and disarmament. Thus,
they seek more peaceful world. Idealists believe that president Woodrow
Wilson’s call for democratic institution will make the world safe for
democracy. Wilson’s 14-point speech delivered in 1981 proposed the creation of
League of Nations. This speech better than any other expressed the basic
assumption of idealist world view. They believe passionately in   the capacity of mankind to overcome the
scourge of war. 
Summary of the 14-Point 
a.       Open  covenant
of peace, openly  arrived at,
international diplomacy  to be carried on
publicly,  
b.       Disarmament undertaken and guaranteed by the lowest point
consistent with domestic safety.
c.       Absolute 
freedom of navigation on the seas 
d.       The removal, as far as possible, of all economic
barriers. 
e.       A free, open-minded and impartial adjustment of all
colonial claims, based on the principle that the interest of the population
concerned must have equal weight with the equitable claims of the government
whose title is to be determined.
f.       
The  evacuation f all Russian  territory and settlement  of questions affecting Russia.11
Idealism 
Idealism was greatly challenged by circumstances which
ultimately led to the outbreak of World War II. 
Critics argue that the war came as a result of idealists’ native
legalistic and moralistic assumptions about the possibility of peace and  progress through human aspiration. The critics
drew lessons from   the inter war
years.  These experiences formed new set
of beliefs and  perceptions about  world 
politics. In the ensuring confrontations, realism or real politic
emerged. 
            Realism is a  political theory which traces its
intellectual roots in Thueydides, a Greek 
historian,  Thomas  Hobbes, an English  philosopher, and  Niccoli Machiavelli,  an 
Italian theorist.12 Realism maintains that the state is
the  most important actor on the world
stage since  it is subject to no higher
authority. It equally believes that the purpose of  statecraft is national survival  in a hostile environment. The  states, therefore, seek to acquire power and
states sovereignty  which is the
bedrock  of international  law, 
gives heads  of state the freedom
and responsibility to advance states interest 
and  survival. There is no
moral/ethical consideration of issues because they are  simply wasteful  and dangerous.
Basic Assumption of Realist
Argument  
a.      Statism is the  
centerpiece of realism. The  state
is the highest actor and all actors in international affairs are  of lesser importance. The state’s
sovereignty  signifies  the 
existence of an independent political community which has juridical  authority over its population.
b.      History teaches that 
man by nature is selfish and no amount of improvement can make man free
from this deficiency.
c.      Man has quest for power  and a great quest to dominate others.  This lead to what Thomas  Hobbes calls 
a  struggle for power “ a war of
all against  all”.
d.      No other state can be relied upon to  guarantee 
your  survival, and  in international politic, the structure of   the system does not permit  friendship, trust and honour.  Allies might increase a state’s  ability to defend  itself 
but their loyalty and reliability 
may not be assured.13 
Criticism of realist approach 
1.      C. Beithz (1979) 
the analogy between individuals in a state of nature and the states  in international  arena 
is misplaced in four ways:
i.                   
States are not
the only  actors.
ii.                
The powers of the
states  are massively unequal.
iii.              
States are not
independent of each other.
iv.              
Pattern of
cooperation  exist despite the absence of
a global government capable of enforcing rule. 
2.      K. Booth (1995) 
realism cannot  speak  to our world. Survival for the majority of
individuals  in global politics  is threatened not by armies of “foreign’
states  but more often by their own
government or more broadly,  structures
of global  capitalism which produce and
reproduce the daily  rounds  of human wrongs such as malnutrition.  Death from preventable  diseases, 
slavery, prostitution and 
exploitation.
3.      C. Brown 
(1992)  the  strongest argument  against 
realisms moral  skepticism is that
states   employ a moral language of
rights and duties on their 
relations  with each other.
4.      R. Cox (1986) realism is problem-solving theory. It
accepts the prevailing order, and seeks only to isolate aspects of the system
in order to understand how it works.  The
idea of theory serving an emancipatory purpose(alternative world order) is not
in  structural realist vocabulary. 
5.      M. Hollis and 
S. Smith  (1990)  realism assumes  that the method of the natural sciences can
be employed to explain  the social world.
Realism can therefore  be equated with a
form  of positivism which  seeks 
to  uncover causal laws that can
both explain and  predict  the recurrence of events in world politics
Despite the 
flaws notices in realism, its 
theorists  continue to think about
international politics in its 
terms.  In  the 
1950s ,  realism enjoyed great
boost as the could war  entered a new
phase which military power  in world
politics  emphasized. Apart from  that, the 
blood-letting in the  former  Yugoslavia in the  1990s 
also helped to  rekindle
faith/enthusiasm  for realism.   
The Place of Realism In
International  Relations: 
            Realism has been the dominate  theory of international  relations since the second world war . Though
there  are dissenters and radicals within   this school of thought, all agree  that realism is one  and liberalism another. Realism is not
an  ideological position but it has  remained central within  international relation, despite series of
criticisms because it has succeeded in revising , reinventing and establishing
an indispensable  relevance for its
perspective within other paradigms. 
            Idealism has lost some of its major
criticisms against realism. Marxist thinking 
now accepts some aspects of realist 
views. The state, vis-avis the class analysis, has been accepted. 
            The 
continuing relevance of realism can be seen in  “neo-realism” or  “structural 
realism” which  recognizes the
anarchical nature of world politics and the dominance of the nation-state in
the global political arena.