I think it's too complex to attribute to one thing, I think you're right that the alt right social media pipeline is real and an issue.

I'm just saying I understand not identifying with a group who trash an identity a person belongs to. They just disengage. Nobody likes being put into a box that paints them as a villain.

Just my opinion of course, the left (as a social group) can examine the current discourse and try to adjust, maybe like framing it as a class struggle or a liberty struggle, or continue being divisive and risk being overridden.