I'm finding it quite sad watching left comrades fall down holes of conspiracy theory. I do feel a lot of this has to do with simplifying complex issues for leaflets, slogans and tabloid like articles that delve no further than to try to create some sort of activity through anger and fear. There was a time I could, wrongly in retrospect, turn a blind eye to this stuff (ie when i was ensconced within a political entity that i was trying to help build... I did have doubts then, but like many, I got caught up in the building rather than the minutea of what was going on in order to build).
The proliferation of vaccine doubters and antivaxx folk, from the left, is a case in hand. I remember the debates around the autism scare back in the noughties in the Scottish Socialist Party. They were often ill informed, and based on nothing but fear and decontextualised, isolated pieces of information, and at times, very skewed and misread data.
I do think this highlights the ongoing issues within the organised, small, left groups. Encouraging suspicion of systems and news sources , and academia, seems to have become a part of SOME peoples activism. These are traits of the far right. Socialism, really should be based on all data, and outliers should totally be dismissed as outliers when studying data. Beliefs and suspicions and conspiracy with NO BASIS really need to be discarded from our discourse.