And when that happens, it is the man's fault for reacting violently, or if you're particularly callous, the wife's fault for cheating. The person who reveals the truth is quite a ways down the blame list.
It's certainly the abuser's fault. But if you can avoid the situation by literally doing nothing (not leaking the info) then you might have a moral responsibility if you do it. And a lot of people think leaking would be a good thing, but they generally only think of breakups and don't consider violence.
1. Millions of people being revealed for committing
adultery isn't anything to rejoice about.
2. This is not the way to handle such a situation.
Neither of these are cowardly, and neither of these give anything to people threatening violence. Outing someone to their abusive partner is clearly morally wrong.
