Don't be so cynical. There are serious problems with schools and there's no visible progress, so many people gave up. They concluded the problems are endemic and permanent and the only way to fix them is to dissolve the schools entirely.
This isn't disillusioned people looking to tear it all down and rebuild a wonderful new system, unless you think Betsy Devos is some sort of anarchist. These people have very specific complaints about the school system that rarely have to do with the actual problems of actual outcomes, because the people who by and large ARE getting actual bad outcomes from the public school system don't really have a voice.