I think there are a lot of reasons and justifications that people use for war. All of them cause great loss for most people involved.

I'm glad you picked up on the double meaning of the last part. I meant that a country can attack it's own citizens and that we have wars within ourselves. Both are things of which to be aware. I'm already working on a post that touches on the topic of the war within. It's not done yet, but I should post it within a few days, depending on how long I take to get back to it.