I know this is a throwaway comment, but I can't let it pass.

> why do you think nobody who you'd actually want teaching public school actually teaches public school in the US?

We're currently doing school visits for our kid, in a low-performing school district, and the teachers and administrators we've met have been impressive. I've worked in education, and visited a lot of schools in another professional capacity, so I know the questions to ask, and things to look for. I have no illusions about there being absolutely terrible teachers out there (and I'll tell you some horror stories, if you'd like), and doubtless any (hypothetical) bad teachers at those schools are being kept away from prospective parents, but your statement is hyperbolic in the extreme. The problems in the US school system are legion, but "every single teacher is crap" is not remotely true.