Just War Theory is the basis on which

Just War Theory is the
basis on which nations seek to legally and morally justify going to war.  Just
war theory deals with the justification of how and why wars are fought. The
justification can be either theoretical or historical.  The need by a civil society to provide sound
justification for going to war is one of the many practical influences that
Philosophy has on our lives.
Thomas Aquinas revised Augustine’s version of Just War, creating three criteria
for a just war. The war needed to be waged by a legitimate authority, have a
just cause, and have the right intentions.  A legitimate authority must wage a just war.  People or groups of people that do not
constitute the legitimate government cannot wage a war.  A just war needs to be in response to a wrong
suffered. Self-defense against an attack always creates a just war; but the war
needs to be fought with the objective to correct the problem that was started.  The main reason of a just war is to
re-establish peace.  In particular, the
peace after the war should exceed the peace that would have succeeded without
the use of force. The aim of the use of force must be justice. The Just-War
Theory is a set of rules for military combat. 

The Prince by Machiavelli offers useful
advice on how to rule a city. He says that the only
real concern of the political ruler is the acquisition and maintenance of power.
For Machiavelli, there is no moral basis on which to judge the difference
between legitimate and illegitimate uses of power. Only by means of the proper use
of power can individuals be brought to obey and will the ruler be able to keep
the safety.  Machiavelli acknowledges that the legitimacy of law rests
entirely upon the threat of tough force; authority is impossible for
Machiavelli as a right apart from the power to enforce it. He believes fear is
always preferable to affection in subjects, just as violence and deception are
superior to legality in effectively controlling them. As a result, Machiavelli
cannot really be said to have a theory of obligation separate from the
imposition of power; people obey only because they fear the consequences of not
doing so, whether the loss of life or of privileges.

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war theory and Machiavelli’s beliefs in The Prince conflict.  Aquinas has justification for war and believes
that nations need
to legally and morally justify going to war. Machiavelli believes that a ruler
needs to do whatever it takes to maintain his position. Therefore if a war is
unjustified it doesn’t matter so long as the rulers do what he feels he needs
to.   A person cannot adhere to both views and
theories. For Machiavelli, people are compelled to
obey purely in deference to the superior power of the state Machiavelli’s
argument in The Prince.  He
counsels leaders to avoid the common values of justice and love of their people
in preference to the use of cruelty, violence, fear, and deception. A ruler
cannot believe in Just war theory and have war that is waged by a
legitimate authority, have a just cause, and have the right intentions but have
war out of fearing the consequences of not
following what the ruler has commanded.