Well, suppose there's a group of people saying that another group of people (which happens to include you) should be killed as soon as possible. In an ideal world, they probably wouldn't do that because they'd recognize that collective aggression against others could rebound on them, but in the imperfect world we actually occupy it happens all the time. Of course, you could just figure they'll limit their social opportunities and eventually grow out of it or develop some higher wisdom, but just how long should you have to put up with threats from random strangers and anxieties about your personal safety while you are waiting for your antagonists to become enlightened?