All: I'd be slow to throw all teachers into the "bad apple" basket. As with all groups, they occupy a spectrum. In one corner are those who truly are committed to weaponizing education in order to indoctrinate the next generations of youth. In another corner are those who truly are committed to producing responsible, thinking adults. There are other corners for the lazy and the incompetent.
My experience is that many teachers really want to do well, but are not supported by their administrators, and have to drag around an enormous body of nonsense rules from their school boards and unions. Also, education is one place where corruption in local government is usually more rife (along with public works) cuz that's where the $$$ is.