I don’t know, but Americans are easily pissed off. Combine that with road rage and the general hatred and and disrespect some people have towards authority…
i.e. people getting worked up and hating “pigs” for pulling them over when they actually were breaking a law, etc., vs. soldiers from another country ramming these same people for what they’d see as no reason at all. I’m not sure if Americans would act any worse or better if the situation were reversed.