Unless you have some training that makes you qualified to assess that (in which case qualifying yourself as such would help), perhaps you should refrain from throwing around terms like that.
It also also says something people throwing that word around like that, especially in light of "TimeToDieJake" thing, denying the impersonation attempts (even though "ioerrror" can't be explained away that easily), finding this [0] terribly funny, while still being unable to back up the plagiarism claims (e.g. Nick Farr answered all sorts of softball questions, but not that). That's very different from anything resembling a good faith effort.
And when it comes to mental health, considering their behaviour and words, I would need to see a clinical diagnosis of ALL involved people to take that seriously in the least. So far I see people who are being abusive saying someone else is abusive; so far I see people demonstrating no empathy, intellectual honesty or capability to reflect, calling someone else a sociopath. So far I see a "community" with very little courage or integrity talking about standing up to bullies, while flagging the story which is clearing up a false claim that has already been spread. A safe space for lynch mobs.
Appelbaum might be guilty of some or a lot of things, but I'm not taking anyone's word for it when they can't even answer the most simple and obvious questions, questions they should have had answers for before even speaking. And the "trust" or "respect" of people who don't notice that is at best of zero value for my own evaluation, at worst it has negative value. And as it stands, I can't interpret the "diagnosis" as sociopath (and plagiarist) as anything than another red flag for those making it, considering all the proof in all this pudding so far, and considering how they don't "criticize their own".
I guess that's also Appelbaum's sinister influence, or something, that so many people don't dare to or are unable to do what a somewhat moral, somewhat intelligent child would already have done (maybe you can even strike "moral" and "intelligent" and replace that with "without an agenda or outside pressure, freely and honestly responding"). Don't put any obligations on victims, after all - including having to prove their victim status that gives them amnesty for any and all transgressions and regressions.
Though maybe they're not transgressions, since a sociopath is not a human being (and just with the victim status, since a sociopath has no rights you don't have to prove the claim after you made it), like someone spookily alluded to but then somehow didn't follow up on [1]. But remember, Appelbaum's allegedly the sick person, so nobody else can be sick. He is allegedly manipulative and dishonest, so nobody else can be.