I think it is more like testing your bounds or figuratively pulling the rope to see if it breaks. Both are innate human (and animal) behavior and in that both a blessing and a curse.

Kids don't know any better yet.

That being said I would probably lose my temper as well when faced with such a situation.

When I'm dropping off my kids and other kids run in my way I usually just stop to chat or play with them, but I'm doing this when walking or on a bicycle.

I guess if I wore a 2-ton suit of power armor I'd just be pissed off instead :)

The main problem here is that the 2-ton suit of power armor doesn't really care about what's behind it when it slams the brakes for a pedestrian, you would probably be pretty upset if you were biking behind me when this happens.

I think it's a great thing that the car prioritizes pedestrian safety, but it's very unfortunate that people would abuse this.

If they don't know by that age (attending school), something is very wrong.