Ah, yes, the old Jim Carroll brainwashing theory. Yes, Jim, it IS likely that teachers may at times express thinking that is not to your liking. But is every idea expressed in school brainwashing, if it does not meet the Jim Carroll imprimatur? I think it's important that we teach children critical thinking, so they can sort things out for themselves. Whether we like it or not, our children will be exposed to unacceptable thinking all their lives. Shielding them from such thoughts would cause greater harm.
I think it's far more important to emphasize critical thinking in education, like the Jesuits do (not that Jim will believe that, since he's such a firm believer in agitprop).
-Joe-