Did you just turn into Rorschach?
As for the question at hand, I don't feel guilty. Generally, if I kill a bug, it's because the thing was bothering me. I don't generally go out of my way to kill bugs. If I'm driving down the road, and see a bug on the other side of the street, I'm not going to swerve just so I can run it over. I'm just a nice guy like that.