So far, I've yet to be in a friend group that wasn't willing to switch to Signal once I explained my security concern. This includes my group of women who are spiritual directors in their 60s, not exactly a demographic you'd expect to care about E2EE.

It's always been easy for me to come up with a circumstance under which something the people involved cared about might become so politically or socially condemned that being associated with it could have major repercussions.

Maybe give that a shot next time you want a group to switch to something private.