Can wars be justified?

Can wars be justified? I heard this question in class and I wanted to give my personal opinion. I think that war can’t be justified for any reason, because the problems are created by the leaders of the countries; because of political, economical or social issues. And is not fair for people to suffer, it’s not their fault. Plus, war has a high price in every way: They lose innocent people, money, weapons and more. And choosing who is wrong or right is not the solution, they have to make agreements to live in a peaceful world. And not because a country won a war is right. For example, if Germany had won in the war… Could you imagine how the world would be right now? War is never a good thing.