The reason why the activist class are among the worst people alive and so pervasive among the left is honestly because a lot of them aren’t that left wing to begin with. Humility, empathy, and understanding are some of the rarest traits in the human race and it is just as rare on the left. Inherently this is why the Bolsheviks didn’t sweep the race in the 1917 election, and why nonsense trying to rehabilitate the Narodniks and popular socialists are always wrong. So many people live in a bubble.
The rehash of the past has haunted the Left through a new 80s movement, Democrats are haunted by the specter of the Kennedy clan, and republicans have wholly not just swallowed the worst of the 80s but also the worst the democrats had to offer in the 80s.
Most activist groups fall into two camps: (1) liberal arts trust fund babies without any understanding of the world, since they’re the only folks who have the time and resources to focus on fixing perceived injustices or (2) astroturfed/infiltrated groups designed to promote inflammatory rhetoric/make left-wing positions look bad
There’s also a strain of (3) narcissists/people attracted to activism as a way of self-promotion, an inversion of (1) typically found among lower/middle class folks who see it as a way to eventually grift, become an influencer and make a living, an extension of the DEI gravy train.