In this district it's two things:
1. Parents freak out when their kids don't have a lot of homework. How do I know? One teacher told me they got complaints if they assigned too little homework, and complaints = being fired.
2. Fear of not being good enough to complete in the rat race. This is on the part of parents and it drives #1.
I had long discussions with the principal of my son's middle school and I could tell he was completely powerless to make any changes. His job was to listen to me and make me feel heard. Problem was, I wanted action. I made my son update a spreadsheet, daily, of his homework per class. Estimated time to finish and actual time. It was a lot of data and when I delivered it to the principal he was a little speechless. He said he'd get back to me.
Btw, the spreadsheet proved one thing: the official amount of homework per day was complete bullshit. Officially it was 1.5 hours. In reality it was 3-4.
Weeks later I saw him at a school concert. He looked annoyed. He thanked me and said it was a "big help" and I could tell he thought he had more power than he did. He probably showed it to the superintendent of the district and they laid down the law. I never heard another word.
The problem is institutional, massively reinforced by the parents.
So we could ask, why are parents like this? One I touched on. The other is fear of what their kids will get into if they have free time away from home. I shit you not, I never see kids out and about in my city. On weekends, a little. During the week, never. Kids don't have free time (here) anymore. They have school. Some have sports and activities. The rest is eating and sleeping.
It is complete craziness and I hate it and I feel terrible for my kid, but I can't afford private school and we're locked into this until he's out of this particular system.