1. We pay teachers like shit and treat them even worse. Even if you wanted to do a good job as a teacher, it's fundamentally impossible because:
2. Our schools are structured and run by busybodies that have absolutely no business being within 100 yards of a school. Curricula is set by politics and ideology, not established science. We have book bans and helicopter parents suing teachers for talking about dinosaurs or evolution or even for simply existing as a queer person in any capacity.
Teachers have been fleeing in droves for years, and many states and locales are further reducing the qualifications required to teach, leading to a downwards sprial.
There's also the intentional and systematic disassembling of our education system by the federal government, as a means of voter suppression. This whole situation was created on purpose to keep Americans dumb and complacent.
America is fucked six ways from Sunday and it's hard to even think about a way out of this mess. It's going to take several generations for our society and government to recover, if it ever does.