Going to war? I think none has the right to go to war. Defending our own country, our values that were disrespected, our properties ... is allowed. But transgressing thinking that we save lives isn't acceptable. In fact, we destruct lives, values, humanity, countries and all the good things that people were finding though the bad events they were passing by.
None goes to war just for the sake of helping. Humans are far away from being Angels.
If the one who is asked to go to war wants just to help, then there are many of peaceful methods to give help. War can have any other purpose but helping.