Think about this.

Why are we killing ourselves?

Not us Americans... Us as a human race.

Why is there so much hate and division in this world?

Why must we kill each-other?

Why war?

Why genocide?

Why killing at all?

Will we, the human race, ever get over this?

What is wrong with striving for world peace?

Rikusaki

The same reason other animals fight with eachother. Fighting is all completely natural.