@TatianaBis
but arguing that it isn't an action that causes a consequence is nonsensical
I haven't, not sure where you got that from. What I said was: apportion blame where it is due rather than on the messenger.
But actually if you want to get philosophical: the messenger is not so much a cause merely the communicating agent of the cause: infidelity.
Truth will out. So if it's not outed by one person it is by another, or the cheater themselves fucks up.
And I am apportioning it. A person who inserts themselves into a situation, unbidden, and takes actions has deliberately changed the course of events and bears responsibility for them.
Messenger, communicating agent, all language to try to imply that the teller doesn't have a hand in causing hurt. And they clearly did. They just think it's worth it. Unless they do it anonymously, in which case they think it's worth it when everyone hurts but themselves. They obviously know they are an active agent if they protect themselves from the fallout!
The thing is, on MN, a cheating partner is seen as so terrible, in all cases, without exception, whatever the context, that there's no level of hurt and destruction that's not worth it in order to try to get them their comeuppance. (Except, of course, if if brings consequences to anonymous tellers. It's not worth them experiencing anything negative.) Wives, husbands, children, all absolutely fine collateral damage if it exposes a cheater. But nobody likes to realise that.
Hence the pretzel logic of having to affect events to get justice (usually displaces vengeance) on the cheater, but also wanting to be considered a messenger or agent, as if you didn't actually carry out a decisive action.