What is this the 1900's? This moral outrage reminds me of the Scarlett letter, and times when women were publicly shamed for being adulterers.
Adultery is not a crime, and it has no role in the law. It is not grounds for divorce nor any other legal claim between a husband and a wife.
I have zero thoughts on a website like AM as it's none of my business what other people do in their married lives, but what these hackers did was illegal and wrong.
To my mind it's no different from hacking into people's private accounts and publishing naked photos they have taken.
You may not like sites like AM but to dress up what these hackers did with some sort of morality, or to say the members deserve this to happen, leaves me frankly quite shocked.