It's a tribe to belong to. If you like that tribe or are in it for a compelling reason, then you might easily switch off that which may oppose it.
As humans, we tend to love our echo chambers and tribes. We love to be on what we think is the winning side. Thus, we allow the propaganda and brainwashing to only favour our tribe.
A bit like people stick to political parties, perhaps? We know they're all run by filth that are all about do as I say, not as I do, but still, people followed Matt Hancock's rules thinking he knew best. Meanwhile, back in the broom cupboard...............