If you're the type of person who believes society is on the decline because [insert scapegoat here] then seeing a video that confirms this is going to feel really damn good regardless of if it's real or not.
On a deeper level, it's avoidance.
Avoiding an uncomfortable truth as it may come into conflict with some deeply held beliefs, beliefs which form a foundation of our personality. If our beliefs are wrong then who are we as a person. That experience is very uncomfortable to us - it feels like an attacks, so we circle around avoiding evidence, confirming our own world view.
And so these videos give a sense of comfort and validation that who we are is not wrong.