I applaud your ability to speak your mind. You're right to point out that there was a very serious change to superheroes and the way they dealt with problems post- WW II and comics code. However, I'm confused on how this is all a part of the leftist/socialist philosophy. Most of these changes came about during the Administration of Dwight D. Eisenhower who leaned right. The Comics Code Authority was created in response to Seduction of the Innocent and the US Senate Subcommittee on Juvenile Delinquency which was created by a Republican Senator (again right-wing politics). The context for all this was McCarthyism and the Red Scare which was about the fear of Communism and Socialism which created the climate that allowed for the restrictions on the comics industry. This is all from American right-wing politics and has little to do with liberalism and socialism. In fact the 1950's arguably was one of the most right-wing decades in American history.
I'll agree that me and my fellow leftists have embraced the ideals of pacifism and have stood against things like the death penalty. I'd like to think this comes more from a place of wanting to see the best in humanity and believing in redemption along with the idea that the law can make mistakes more than being part of a totalitarian regime to destroy the individual and justice.
Again, I'm impressed by your ability to speak your mind and I believe you're obviously intelligent. I just don't buy the idea that this is part of socialist agenda.