I think on the Left we have a "virtuous" cycle/feedback loop that results in increasingly outlandish positions.
Essentially, for most people there's a serotonin feedback when people upvote, applaud, reteeet etc. People, responding to incentives like anyone else shift their online discourse to match.
Similarly, even beyond the positive feedback, on thr Left no one wants to be a white cis male contradicting the feelings, emotions or arguments of a POC or LGBTQ+ person.
The Right doesn't really have this problem as the Far right opinions are generally understood to be reprehensible to most people so those movements have evolved to work on dog whistles etc.
It's a structural issue but one that puts us out of touch with the mainstream (consider defund the police, transgender athletes or immigration until we were getting murdered in the polls and it was too late to do anything.)