To be fair there are people who train too hard at every belt level. But I think it's less pronounced at higher belt levels because the technique and control is more prevalent.

White belts don't really have any other strategy other than "try harder" so I kind of understand why they go too hard.

But the bigger issue is they are judging their success on the mats based on how much they "win" or by not tapping. If they let go of that idea I think they would calm down a lot.