I don’t know about other people, but pretty much the only reason that I didn’t become a socialist earlier than I did is because I just didn’t know what socialism really is. Someone has to be straight up evil in order to understand socialism and still oppose it.
I know this is probably pretty obvious for most people but I only became conscious of it recently.
Marxism is a thought that has a philosophical background that has proved through praxis to provided a cientifically driven analysis of society’s history and economics. It is not a matter of discussion wether or not Marxism is correct, of course a better understandment of it can still be achieved, but opposition or agreement comes from the comprehension of it, or by a total refusal of empathy by other human beings.