It doesn't. I suspect that many of these posts are paid shills.
But some are people who are willing to believe any conspiracy theory and won't listen even when you present them with facts.
Like the fake origins of the Protocols of Zion.
And there are so many people who have been listening to people who don't comprehend what the Bible says or history and so they have all kinds of flaky religious interpretations to support their flaky beliefs about the Jews.