I think True Believer is worse. I would say that if someone is willing to try something while still willing to accept that it might not work but need to confirm they'd be a rational person. A True Believer will not accept that the thing is not working and try to rationalize why others are still wrong.

They are generally dangerous but they are truly dangerous when what they believe is itself dangerous.

I'll be using that

You’ll like the Simple Sabotage Field Manual too:

https://archive.org/details/simplesabotagefi26184gut/page/n1...

It helped the allies win WWII. It contains lots of good advice (and the white collar chapter should be required reading in corporate training).