NHTSA very notably didn't care about pedestrian safety at all. Luckily that finally changed, they started testing for that for 2027 models onward.

IIHS only really tests how good a car is at preventing an accident, not what happens when it fails like for example Euro NCAP does (and so does NHTSA starting nowish).

if it's so safe why is it banned from many european countries for safety concerns?