Does anybody else experience an epidemic of parents just throwing out every paper in their kids' backpacks?

In the last three months, I've experienced a massive uptick in students saying their mom cleaned out their backpacks, throwing every paper away, including homework, class notes, multi-day warm-up sheets, project instructions, etc.

I call home, and the moms confirm they do this.

I don't get it. Do they not understand that, maybe, paperwork is to be returned?

Has anyone else experienced anything like this? I feel like I'm going crazy.