[mrob]

I can remember several teachers who really cared about helping the students learn, and who always tried to do their best for them. They'd even go beyond their official duties, e.g. I learned the basic concepts of trigonometry before I was officially allowed to learn them from an off-duty math teacher.

But despite them being personally good people, by accepting the job they bought into an oppressive system. If they tried to improve things too much they'd be fired. Existence of good teachers doesn't make the system as a whole good.