It's the result of years and years of psyops from hostile countries. It cracks me up that people still think it's one ideology that's at fault.
A Russian (only one of the autocratic countries trying to weaken the US) think tank literally published a playbook of how they will weaken the West from within. It's eerie to read this and see what they've accomplished:
en.m.wikipedia.org
Life in the US/Western world is incredibly nice compared to how life has been throughout human history, but people are convinced that it's so terrible right now.
For a solid 8 years, it was the far right that was their biggest mark. But now with this pro HAMAS nonsense you are seeing the Iranian Internet payops are brainwashing the far left with ease.