Let's see... I've taught a few kids how to fire shotguns and rifles (and let them try it, of course), I've told my mother to go fuck herself and moved out of her apartment twice (don't ask), I chose not to tell my GF she had blatant signs of meningitis a day before she died of it (please don't ask), and of course, I've hunted and killed a lot of animals. After that, there's a lot of small harm I've inflicted on people. Strangely, I've had the most guilt over stealing things from other people. I can't bring myself to deprive someone of their luxury and let them feel the consequences. Oh, but killing them isn't as bad. I'd be doing them a small favor by taking them to the next life prematurely. Dogs, cats, and bears don't count. Those 3 animal groups are legit, and I would never want to harm them.
Before any of you ask, yes, I know, all of this points to me becoming a psychotic killer. I have a messed up sense of morals, I acknowledge this, but I never looked at a human and thought I wanted to kill them. Yet.