Look if you don't think there's any evidence to support social media and the pandemic leading to both a decline in mental health and radicalization, I don't know what to tell you. Not only have there been like a million different articles on it, but this is patently obvious to the vast majority of people who lived through the entire thing.

This isn't exclusively a middle aged man thing, a conservative thing, or even a political thing. A ton of people struggled enormously during the pandemic, sought solace in social media, and left with an extremely weird set of beliefs.

I'm sure I could find some of these sources, but I feel like I'd be trying to convince someone that the sky is blue. This is so abundantly obvious that you've either been living under an extremely large rock or are dead set on believing what you want to believe.