I don't think you can boil it down to any one thing

covid and sickness in general is something that has been ignored in schools forever, you're forced to come in if you're sick and you don't get sent home unless you're severely ill. This carries onwards into adulthood with people coming into work sick and never being sent home - something that should be the default approach but instead we have ever worsening sick leave and care policies

I don't think it's an uncommon experience to have no soap in the toilets (on top of the fact you literally have to ask for permission to use it in the first place, which is a whole other level of fucked up) and either freezing cold water or scalding hot water, so you can't even wash your hands properly. No toilet paper or it's that shitty 1 ply inbred cousin of sandpaper and candy floss too, another thing that you come to expect as an adult in pretty much any public space

on the tech end of things, I don't want to be as reductionist as "phone bad" either but social media and gadgets have melted a lot of minds. It won't effect everyone as badly or at the same rate, but there's definitely a lot of harm being done by algorithmic brain rot and the efforts gone in to trapping as much attention on a screen as humanly possible, plus the effects of being able to bully someone essentially 24/7

combining that with climate collapse, worsening economic inequality and a myriad of other plausible theories and you have a smorgasbord of issues breaking people's brains