What's going on here is that we don't give a shit about people, and we like pretending that the world is fair, so whenever we're committing an atrocity (yes, this is an atrocity, sleep deprivation is a form of torture), we try to blame it on the victim. Because "we have generated an atrocity, built our society around it, and are now trying to not come to terms with that" is a tougher pill to swallow than "teenagers just all, universally, suck".
This is garbage and I really wish parents would start seeing this as a big issue, big enough to raise hell not just with their school, but with their job and with society at large. Parents sure seem to have enough energy to cause teachers problems...