What was the biggest bloomer moment you ever had, related to socialism? (If you ever had one ofc)

When I got what it actually is (learning past the revisionist takes) and truly understanding that it's inevitable. Like the whole "I might not see it in my lifetime, but historical forces..."

I read a memoir of a long passed local communist and she ended her book with exactly these thoughts. I remind myself of that anytime I start feeling doomer.