Yeah, I came to the same understanding when I used to counter conspiracy nuts denying climate change and evolution etc.

You'll never convince them they're wrong or hypocrites... But people who stumble upon the thread that are not super critical thinkers will see the discussion and you can help them realise the person is actually full of shit.

Sometimes they can lie believably enough that people fall for it, and some of those people will snap out of it when they see the contradiction and logical fallacies.