It's like any other collection of people, except maybe what's hard to remember if you're in tech is that in public bureaucracies there's no high pay, inherently "interesting problems," or prestige factor attracting the bright and ambitious; just job security and pensions attracting the risk averse and allowing anyone toxic who makes it in to remain.
The district my wife left had double digits percentage turnover in their senior administrative roles during the pandemic - that would be enough to keep most organizations from operating to their full potential.
Additionally, they really don't get to make their own decisions - not only is there a chain of command but there's a surprising number of things that have to wait for school board approval and quite a few sets of regulations to navigate. I've been in regulated tech like medical device, and my perception is that what the school admins deal with is a whole other level.
While agreeing with everyone that "raisin d'oatmeal" is genius, and while also agreeing that it's clear that the US has basically failed at running public schools, please don't claim the administrators are somehow the sole agents of this. Like many things in this country it's born of a complicated web of political power being wielded in both good and bad faith by people with varying opinions of what would be best across many decades and scales.