I completely get what you're saying, but with the other "frowned upon but not illegal" activities you haven't explicitly promised (in front of a lot of people) that you would stay together - for life. It is different.
In any case, the hacker's motivation wasn't that at all - it was that the company behind Ashley Madison had promised to delete user data for $20 per user - but then didn't actually do it.
I completely get what you're saying, but with the other "frowned upon but not illegal" activities you haven't explicitly promised (in front of a lot of people) that you would stay together - for life. It is different.
In any case, the hacker's motivation wasn't that at all - it was that the company behind Ashley Madison had promised to delete user data for $20 per user - but then didn't actually do it.