Like this. I agree totally with what you're saying. I just wouldn't word it that way. I'd say "you aren't responsible for her being hit if you were just trying to help". I would say the action of her getting hit was bad, and even morally bad. Who's to say anyone's "responsible" though? I'm sure there are situations of things that "just happen" without someone being responsible.
Sorry to jump in the middle of you guys' conversation but I just got to ask this. Do you consider tornados or other natural phenomenas morally bad? Considering they sometimes kill people.