Anyone who wrote that bilge would have done so knowing they would be fired from one of the best-paying, most employee-friendly employers around. It's also telling that he declined all interviews (not much of a way to push a manifesto or encourage an honest dialogue, is it?) except for two ultra-right YouTube trolls.
My guess is he has looked at Milo, Shkreli et al and figured "you know what? That beats working for a living" and we are sadly going to be seeing a lot more of this jackass.