I mean, I've been a giant asshole to a couple ex-partners (read: I cheated), and they never got together to coordinate an attack "to ruin my life."

I could maybe, maybe believe a well-known political figure might be the target of that kind of coordinated attack. But basically a thousandth of a percent of the population has even heard of Jon Pretty. What benefit exists for the group of accusers? An extra spot for a presentation at a Scala conference?