The problem is global and started in 2014. Student debt isn't an issue in many countries.
Social media seems like the most obvious one to me, if you look at popularity graphs of the various sites it seems to line up pretty well.
Gen Z and A even have a term for it - "brain rot". If you go down that rabbit hole of memes, it becomes obvious there's a lot of self-doubt, confusion and angst among that generation, with weirdo influencers impacting their thinking in fairly deep ways.
... until you finally track down who wrote this mess, and it was you 5 years ago.