One train of thought is that if a animal is attacking, it is better to kill it then, rather than run it off to later attack someone else again.
Taking this line of thought to its logical conclusion, shouldn't we just shoot all bears on sight before they have the opportunity to attack?
Then we can start on the wolves, coyotes, snakes, and any other animal that poses a potential threat. Safety first! (along with a dash of sarcasm).