I work with an animal rights person.
In the last 10 years or so the black bear population in NW New Jersey has taken off. The population got so large that NJ now has a bear hunt.
It's not unusual to walk out your back door at night and see something big and furry strolling through the neighborhood, which can lead to some scary encounters for human and bear both. But what if some night that bear doesn't turn and run away? I asked that animal rights lady if I would be justified in killing an aggressive bear. "No", she said. "That bear has just as much right to your back yard as you do."
Well what if I were killing the bear to save a child's life? "Their is nothing to justify killing" was her answer.
I left it at that.