It’s been my experience/understanding that in the US someone hitting a car from behind is almost always at fault. The onus is on everybody to avoid an accident.

It’s been my experience/understanding that in the US someone hitting a car from behind is almost always at fault. The onus is on everybody to avoid an accident. But that doesn’t include forcing a car to continue forward. Also people commenting here are likely from widely disparate parts of the world with different driving laws. Those differences are more than enough to preclude useful discussion here at the extremes.