The situation that resulted in my legal case began when I discovered that my girlfriend was having unprotected sex for money with other people.I have no idea if any of the garbage he is saying is true, but if it is true (which I doubt) it would be quite possible that she did it on his behalf.
Many of the Valley "power couples" have a dynamic where the female sleeps around (and the male knows this) to make business contacts for the male. It's unclear, in many of those cases, whether it's a true relationship or a business partnership. Where it gets nasty is that expectations sometimes change.
That may or may not have anything to do with what he's saying about her, and given his history of abuse, it's quite possible that nothing he's saying is true.
People like Tom Preston-Werner or Brendan Eich, imho, didn't deserve the level of attack they got, particularly considering the case was not so clear in their cases (lack of reliable data in Tom's case, distance from the guilty event in Brendan's).
I agree with you on Tom. He seems to be better than 95+ percent of startup founders, and had to fall on the sword largely because of Github's sterling reputation (which, one presumes, he helped it earn). If I had to guess, his actual failure was letting the wife involve herself in the business. There seems to be an objective record of that. It's not necessarily scandalous, but it is a mistake that one can't afford to make at that scale. Companies reach a point where informality (i.e. boss's spouse can come into the office freely) isn't allowable anymore.
As for Brendan, it isn't his political leanings that are at issue. The secret ballot is, in my opinion, sacred and if somehow it had been exposed that he'd voted for Prop 8 or Bush or whatever, I'd be the first to oppose people using that against him in his work. However, political donations are public activity (and should be). He also had the opportunity to come out and say, "That was 6 years ago and I made a mistake, and here's what I've done and will do since then." He'd probably be forgiven.
However, neither of them are remotely in the same category as this turd.