Mother nature is just about the most blood-thirsty, violent b*tch imaginable. We are nothing more than the product of nature's design - the product of violence that has no ending.

Without violencee.g the violent extinction of the dinosours and the domination of mammals on the earth through force - we humans wouldn't even exist.

Nature couldn't care less about justifications. It only cares about survival.

Therefore, in my opinion it doesn't matter whether or not violence is "justified" as such. All that matters is that we try to avoid it as much as possible - without dilluding ourselves with the idea that violence can be avoided forever.

You may walk through a beautiful jungle and see nothing but peace and tranquility. But look closer, and you will see raging violence everywhere.

Evil is a matter of opinion.