It’s possible that people can actually be former leftists/socialists/communists/etc and have “left the left” so to speak. I’ve been noticing here that the common response to this will be “they were never really leftists/socialists/etc. anyways” or “they were never really serious to begin with.” It’s possible that it could be the case, or maybe they actually were on the left, but they just didn’t have the stomach for the real shit I guess.
I think we shouldn’t be too quick to jump to using the “no true scotsman” fallacy in these cases. For those who don’t know, it’s basically saying “you weren’t REALLY a leftist, cuz otherwise you never would have left.” The same argument is used by religious people when someone leaves the faith: “oh they were never a REAL christian, otherwise they wouldn’t have become atheist/agnostic.”
To give some concrete examples, take Eldridge Cleaver. He actually was a Black Panther, radical, communist, etc. but then later in life became a Reagan conservative. Or Angela Davis. She actually was a radical but now she tells people to vote for Biden.
TL;DR: People can and do change, sometimes for the better, sometimes for the worse.
I think it’s a fair refrain, there’s no way to prove whether any particular person truly understood what they believed, believed what they said before, or believes what they claim to now. Especially in our reality, for the left, wherein capital can simply pick off leaders or representatives of change, it’s best not to consider such claims and just cut the loss.