Possibly, most of my technical "teachers", couldn't hack industry, it was only after working in the engineering industry that there were tales of my old "teachers", who were complete Dilberts on the shop floor/drawing/design/development offices.
Another instance is art "teachers", everyone a potential Da Vinci There are other examples, but on the whole, teachers have a tough job, but some just like to "think" that all their pupils are untermench from parents who are substandard.
Parents usually only have 2 or 3 kids to teach at a time, teachers have 20-30. They can't babysit the lot of them all the time, gotta throw some raw meet to the exceptionals and teach the rest. I wouldn't do a teacher's job for twice my wage. It'd be **** funny if they all packed up tomorrow and left parents to teach their own uniquely talented and brilliant children.
Parents have them 24 seven my friend, "teachers" don't. If they all packed up tomorrow, then, more than likely, the anarchy that this would produce would sink them, not a parent looking after a child.