I don't think that exposing peoples private lives, even though they did something wrong, on this scale is remotely funny. I think it is quite sad. It does not only effect the members of the site, but also their families, the company they work at, etc.. This breach has so much collateral damage.
It's not funny, it's tragic -- which can have a element of dark humor. It's exposing several dark facets of human nature: the desire to cheat on one of the most solemn commitments a person can make, and the vengeful joy others take in seeing those cheaters exposed.
