Nothing wrong with feeling that way but if you're a meat eater then you're simply paying other people to do your killing for you, right?
And as for the war thing, and killing people, I don't think anyone loves it. The biggest reason that we seem to be in a never ending war is due to religious beliefs, and the fact that some people of the Muslim religion hate and want to kill anyone who isn't of the same religion.
To tie this back in with the gun control topic, the threat of being attacked here in the United States by terrorists is one of the main reasons I can think of why some people may want to have AR-15's and high capacity magazines.
The other reason would be some sort of natural disaster such as an earthquake, hurricane, tsunami, volcanic eruption, etc., in which power is out for weeks, or months, roads are impassible, no food, no water, etc. In this kind of situation there will be people trying to steal whatever you may have. Law enforcement won't be able to help and if the bad guys have AR-15's, I'd want to have one as well.
Just some of my thoughts on that since so often I hear people say "why would anyone NEED a rifle like that, or a high capacity magazine?"