A war is only just if it is fought for a reason that is justified, and that carries sufficient moral weight. The country that wishes to use military force must demonstrate that there is a just cause to do so. ... Sometimes a war fought to prevent a wrong from happening may be considered a
Can war be morally permissible?
According to Just War Theory, violence is only permissible when it is a lesser evil than the alternatives. For a battle to be considered morally permissible, it must be ethical before, during, and after the conflict.
Why is it good to have war?
freedom: how war affects human lives. We think of wars as things that happen between countries. ... And every war will change people's lives - it might give them freedom, keep them safe, hurt them or their family and friends, give them more money, give them less money, bring them power, take away their power.