Now, I will say that the Pandemic was pretty traumatic here in the US, at least a million people died last time I looked at it. Those people were somebody's neighbors, grandparents, uncles, etc. So maybe the realization that "nobody gives a shit about you except for your productivity" was a lesson they internalized?
Largely, I think it is the parents though. Like I said, I have kids, and when their grades slump, I get on them to fix it. A lot of people are really unwilling to do that.