If the teachers are “certified” and had to jump through the hoops of the completely useless “Education Department” of any college or university, you are correct. Pair that with how hard it is to fire incompetent teachers because of tenure and it’s a recipe for complete disaster. What needs to happen is for these departments to be abolished. Those wanting to teach others need to be masters in their subject matter. No excuses. No exceptions. Ban the unions and tenure as well. THEN — and ONLY then — would you begin to see the state of education in this land rise.
If Einstein then asked them to be quiet so that he could teach, 10 of them would collaborate to write a statement that he said something sexual or threatened them, and then Einstein would be removed and put into the Absent Teacher Reserve or worse. Whatever the kids say is "substantiated" and the teacher is not believed at all. The teacher's authority is undermined, heck, blown to complete hell. The teacher is the prey of the students, who don't want to do any work and yet want a passing grade.
But all you can complain about is teachers unions. Walk a mile in the moccasins of a NYC high school teacher, then get back to me. If you live long enough. I've seen 2 colleagues carried out on stretchers and numerous others assaulted and injured.