Then the speed needs to be reduced.

Reasons why this community exists.

Fair point, it was indeed between crosswalks. But from the sound of it, the kids had been waiting to cross, and the younger kid jumped out on his own.

The older kid saw the danger, meaning the car should have been able to see at least one kid too. I maintain that if you can't react safely to kids you can see jumping unexpectedly off the curb as you drive by, you have no business driving.

You see unaccompanied children, you take your foot off the gas and hover over the brake pedal.

It doesn’t matter where I’m from, you are supposed to be able to stop

If I'm driving in an area where pedestrians can be present and my view of a walkway is obstructed, I slow down. A speed limit isn't an obligation nor is it a right to travel at speeds that have the potential to be unsafe. I treat every blind spot as if there's something behind it ready to jump out at a moment's notice and I adjust my speed to anticipate it. I do that because I believe operating within legally defined parameters doesn't exempt me from the responsibility of my actions causing harm to another person.

We as a society are far too lenient toward drivers who take for granted the fact that they're in control of high-velocity heavy-machinery that can and do kill people on a daily basis. Traffic deaths aren't an inevitability, in most cases they're caused by overconfidence.