Who in their right mind is going to argue that we should kill all children just because some of them kill? That's precisely the level of argument being put forward here by one or two posters.
OTOH, I have a 50# 9 year old daughter, who likes walking around our sidewalks.
If stupid neighbors had a large aggressive dog which regularly got loose, I'd have a major problem with that. If it was an unstable pit bull, I'd be very tempted to take preemptive actions. But there are no such dogs in my area, so it's just speculation.
Now, if I lived on major acreage, I'd probably have a couple of dobies.