Anti-Truth Ideologies

It seems to me that a lot of ideologies that are wrong aren't simply wrong about their conclusions, they are wrong about how to even figure out what is true. And some seem to be fundamentally enemies of truth.

This is inevitable when people believe they have some goal that is more important than the truth, they will sacrifice the truth to achieve that other goal. For the correct view on this, see my discussion of what is most important, and why truth has to be first, or at least tied for first.

Win-Lose fundamentalists
If you are trying to dominate and win at the expense of others no matter what, then what people believe is just another tool you will use to accomplish that. Hello propaganda and disinformation.

We see this with totalitarian regimes, like the old USSR, the Nazis, and with Trump.

Faith
Religious faith is an interesting case because they think they do value the truth. There's this thing they value and believe, and they think it's true. The problem is that they are wrong, and they can't easily be corrected. Because the religion is designed to make them value the belief more than reason itself.

This is why some seem to be positively compelled to come up with completely unreasonable excuses to believe something that is clearly not reasonable.

A lot of their teachings are designed to ensure they can't be corrected, you get things like "doubting Thomas" (it's better to believe without evidence that it's true! wait, what?), and threats of hell if you stop believing.

New Age
It's difficult to pin down the origins and motives at work here, but a lot of New Age religion is really anti-reason, and anti-truth. See some obvious examples on my page memes that are basically confessions.