Not dealing with state secrets but ultimately what's important is up the users. It's worth trying to avoid the forum from being hacked just so that emails aren't stolen and spammed. Maybe it's not time practical or cost feasible to deal with hacks, but they do exist and we do exchange personal information here, there are call signs, physical addresses, schedules (e.g. when you may not be home), names of family members. It's not totally benign. Everyone blurs license plate numbers in photos because they want some sense of privacy, what does an attitude of "Possible hack, so what?" convey?