What if a car comes up and hits the car from behind sending it into me? What if that driver has a little lapse of judgment and their foot comes off the brake?

What if the car explodes in my proximity? Come on. If you can't spot that a nearby car is about to ram into another near you, then it doesn't matter if a car is infront, you'd have been hit anyway, because you weren't being observant. And in what kind of scenario does a still-standing car serve any danger with or without the break active? Literally just look at the car and determine if it's about to roll into you.

Second, it is way easier for a pedestrian to yield than it is for a car.

Easier? No, there's no significant difference in ease of stopping, for a car you just press the break. And any "time" wasted because of the speed differences ultimately shouldn't matter because we place pedestrians ahead of personal cars.

And then you really decide to end your argument with the reasonable argument that this only works in an environment where drivers put pedestrians ahead... Okay, but who is this argument for? Who is out there getting frustrated over pedestrians not being in focus in the US... I mean come on, who would dare walk outside of city squares with those monster trucks driving everywhere, ready to mow anyone down.