I disagree with you.

Erroneous beliefs lead to erroneous actions. How about the inqusitions and the crusades? What about the Muslims who murder people so that they can get 72 virgins on becoming a martyr? What about the numerous C hristians who believe that Jesus is coming (the rapture) and that he will save them from climate change and fix the whole situation? They are, therefore, quite happy to continue with their destructive practices.

Regardless of whether they are small things or big things, all beliefs based on things that are not true are destructive to the greater good.

And very definitely, some are worse than others.

In my opinion, they're all bad.