Not sure why the left can't see its polarization. It may be less insane considering the vast repository of utter bullsh** in years of "q drops", but it is arguably more impactful as it relates to to penetration and the hijacking of the party.
Occupy movement, which splintered and also led into the socialist based Anonymous movement. These factions splintered multiple times over with more going down increasingly narrow paths. Antifa strengthens and BLM emerges after the Travyon incident, with both having more and more mainstream acceptance, but both also being formed out of tactics and methods used and by the same perpetrators. Occupy penetrated all the way to the Bernie movement, which was more mainstream than anyone ever thought possible. But the fix was in and Hillary won the primary, which furthered the resolve of this movement, further empowered antifa, etc. The green new deal and squadies gained power and took over the party. There are tangential conspiracies along the way, like Russiagate and others that were mentioned. Trump seemed to bring even more out. Not sure how many smoking guns we saw before he was impeached. Enter George Floyd and we have a massive socialist supporting ideology that has penetrated the corporate and investing world, through ESG investment targets, etc.
On the right, you do have a response to Obama that led to the tea party movement. This grew out of a lot of liberty based anti government mentality. You also have the effectiveness of anonymous, and elements that teamed up on gamer gate. Then you get into the trump rise and pizza gate was an easy follow from something that was sure to come out of the Wikileaks drops. Continually shamed, these degenerate elements dug in and further weaponized the movement and core beliefs with Q. Q has certainly penetrated mainstream ideology, whether through a belief in Q or simply because the liberty based anti government tendencies were always there and have allowed this snake oil to be sold.
The left will refute that it's alt-left fringe movement has anything to do with BLM, which they believe is sacrosanct and you're a racist for ridiculing or taking issue with their beliefs. However, every single movement grows from some level of injustice, whether real or perceived. Every one.
And like I mentioned, the continued polarization through algorithms will only keep us going down this path. One where we struggle to even understand the others point of view, and certainly struggle to accept that our own is tainted. This is a hurdle with Q followers to this day.