What I never really thought is that that‘s still a pretty dumb was to subsidize any kind of purchase. It massivly advantages the rich(er). Why do it that way?
The US middle class is relatively lightly taxed.
Anyway, this is pretty far off the original question of why EVs are being subsidized via tax rebates in the US.
By making the car more affordable for wealthy (but not that wealthy) people, it eventually brings the cost down for everybody.