This discussion might be a little above my pay-grade, but you're seeming to conflate "unknown participants" with "untrusted participants" from this response. It

This discussion might be a little above my pay-grade, but you're seeming to conflate "unknown participants" with "untrusted participants" from this response. It's possible to know someone without trusting them. I think that it's pretty apparent that there is a difference between an unknown anonymous actor, and an actor that you know, but just can't 100% trust.