Today's parents don't know to question the schools because they received approximately the same sort of crappy education 20-30 years ago. YOU went to private school, you're older than that, or you're just especially bright?
Especially bright/sarcasm.
Think about it. When did the public schools really start to go downhill?
Parents of today's students went to school during the 70's and 80's.
I went to public school.