I'll bite. Teachers unions are the most powerful worldwide and yes most get away with murder. Now lets talk what we actually expect of teachers. We expect them to create Einsteins out of every last child in the USA. Well you get what you pay for. Don't like what kids learn in PUBLIC schools? Pay for a PRIVATE education. How many of those 7% children have their parents help them with their homework or just have a family learning time? The worker can only do so much to mold the clay. Funny howv most parents don't want to take the blame that their kids are dumb because of home and peers, so they'll blame teachers, and then say how the unions are the root of all evil.
Hillary Clinton said it takes a village to raise a child, somebody better go find this village.