They are EVERYWHERE - it’s their purview, to be in “Edumacation”. They need “education” schools rather than just majors with a few seminar courses about teaching. That in itself means it’s rife for liberals.
Trust me, private/Catholic schools are not immune to this poison either.
You can mold children, as they are more pliable the younger they are. Nikita Khrushchev once said; ‘We will bury you’. Now we know exactly what he meant, don’t we? They were willing to play the long game. It took a little more than 60 years to accomplish.