I think world peace is unrealistic because humans are so prone to violence. Whether or not I'm a pacifist really depends on other people. If they don't want to fight, I won't, but if they want a fight I'll give them a war.
Wait, so you can't be for self-defense if you're a pacifist?
A true pacifist's ideals are that all violence is unjustifiable and wrong. If you want to see a popular example of this in media, look at Morgan from The Walking Dead. Sorry for spoilers ahead, but in that show, Morgan refused to kill even after people attacked their group.
Ah, thanks. I guess I wouldn't be able to call myself a "true" pacifist then. At some point you gotta fight back. I don't think violence is ever the solution to anything but when you're running out of options you gotta pick the least bad one.
I do like Morgan though, he just needs to get his act together.