Still, I think that there may be- rare- situations where it's necessary to harm other people in order to be individually happy... because if you don't, then that means that it becomes some sort of abstract thought or dogma, like "thou shall not harm thy neighbor". But I also have to admit that I can't think of any example where consciously inflicting pain on someone will bring you more pleasure in the long run... what do you think on that?
There could be an instance of a "protective use of force"...an act of self-protection coming from a need to defend your own safety or the safety of someone you love...in which you hurt someone out of self-defense, but hopely you can do it in such a way as to not kill or mame them.