Personally I'd say it's no more wrong then it is to kill characters in a video game. People have varying degrees of morality though and this subject is not universal it is relative. In my own view point I find having moral issues over something that isn't real is kind of silly. It's kind of killing yourself really I wouldn't say it's moral issue, but I guess one could argue it could harm your own sense of self love and/or respect or if it's so easy to kill these projections of yourself it could signal a lack of self respect in the first place. Just a thought that crossed my mind it may not have anything to do with self love but I'm just trying to give a alternative perspective.