In cases like this where it is word against word, I think it is important as an outsider to hedge your bet. Act as if the allegations are true and false at the same time. Assuming they are true: make sure to create a safe space (virtually, in real live, and in discourse) for potential victims. Don't put the accused person on sensitive community functions. Take (this and further) accusations very seriously. If someone…
It's also worth being aware of the possibility that Jacob Appelbaum is himself an agent of an intelligence agency (either a plant, or someone turned informant once they realized they could blackmail him and that a creep is a useful informant), and his behavior is a way to maintain his power and in turn the intelligence agency's.
Argument 1: https://inciteblog.wordpress.com/2010/07/15/why-misogynists-...
Argument 2: https://medium.com/@nickf4rr/hi-im-nick-farr-nickf4rr-35c32f...
"But really, I thought, why would Jake be so defensive about some random [lightning talk] that might have otherwise gone completely unnoticed? If I were a government operative hell-bent on destroying the global hacker community, what would I do differently from what Jake is doing now?"
I don't think this is particularly likely over the simpler explanation that he's a non-government-affiliated creep, but if we're going to give credence to "A government agency that hates Tor was behind this," it's worth looking at all the possible ways a government agency might get an advantage out of the situation.