These seem to be good examples of potential dangers. More include believing stupid nonsense, doing generally irrational things, being locked into an exploitative social network, etc.

I think I have a better image of your concerns, but it's still fuzzy. Could you go into more detail?

(This is on my mind a lot because I recently got in touch with an old friend who turns out to be deeply creeped out by LW and CFAR in a way I'm trying to understand better.)

Is "stupid nonsense" the same as "false beliefs"?

I'm unsure about "doing irrational things", too. I have acquaintances who consider pursuing intimate relationships to be "doing irrational things", and others who consider the same of playing board games. So I hope you can be more specific.

"Being locked into an exploitative social network" is a huge big scary serious concern. That's why I linked to "ABCDEF" above, since it's intended as a guide to avoid those, written by someone who has experience as a member and leader of a large number of nonconformist social groups (namely, neopagan religious groups). Did you get a chance to read that?