SA, I disagree. The ability to recognise conspiracy theory is a very useful heuristic. I know very little about the workings of the immune system, but I didn’t need to in order to recognise that “a second wave is impossible” Yeadon was very probably talking bullshit, because it was so obviously conspiracy theory; “what they aren’t telling you…” etc. Later, ET discovered that he’s floating a company that stands to increase in value from further infection.
The ability to recognise conspiracy theory from its own features is a sort of intellectual immune system, and in the case of covid-19 it could have saved countless lives.