Fourth: for almost anything in life, knowing the truth doesn't matter in practice - instead, people believe things that make for good social objects, i.e. catalysts of discussions with other people. In cases were being wrong leads to direct and near-immediate consequences, people tend to learn the truth quickly. The problem with that is that today, a lot more things have delayed effects, or effects that only material…
Well said. So, someone spouts a well researched conspiracy and others engage in a conversation and the person gets to recite their well prepared talking points. That feels good to the person, that's positive reinforcement. That's a story they can take to their online echo chamber for even more positive feedback. They hold on to the conspiracy as something to talk about, and as something they can feel superior about.…
IME, this is how most not-directly-impactful knowledge is used by people. I've been in countless such situations, and it's painful for people with stronger affinity to truth. Unfortunately, under the guise of "good manners", society teaches you to shut up.
We shouldn't avoid debate. We just need to ensure that people debating are there to discover the truth, and not just pick up morsels to share at dinner parties.