I think my biggest thing was that I totally bought the Steven Pinker line of “the trend of all history is that before civilization things were a horrific nightmare and ever since things have been slowly getting better and will continue to forever.”

Edit: oh yeah, I remember I was very sure all politicians were corrupt and capitalism was kinda fucked, but also “communism is good on paper but doesn’t work because people are greedy” (not that I actually knew what communism was) and also “this system is bad, but it’s the best one we’ve got.”