When I was an active Dub, it happened twice in my cong. The first person DA's herself, and rumors were that she did it cuz she wanted to have gangbangs [ugh, what a bunch of hypocrits were we], so I felt it was okay that he hould be shunned.
The other person was DF cuz she'd commited adultery, and I know about it, so didn't feel bad for her, did feel bad for her hubby tho...
Then, as I was on the track to become Satan's sidekick, , there was an entire wave of DF-íng inactive people. I didn't really care, cuz I didn't know those people, and because I was in deep trouble myself.