Dunno if it's autism spectrum or not, but I think Bob has a fundamental problem with distinguishing between fiction and reality. I said it before, but I think Bob has a basic problem with understanding that movies are not real. Like, on a surface level he'll acknowledge that they're not real, but from his behaviour it feels like he just knows that the characters and stories are not real while the underlying rules and concepts are, in fact, real. Like, the good guys win, the nerds get the hot girls, and the bullies are beaten. Violent protests result in meaningful positive change, and the main characters (aka those who matter) are never hurt during a riot.
It's not a conscious thing, just some underlying misconception about reality. The resulting cognitive dissonance is gnawing at him, especially since 2016. He KNEW that Trump couldn't possibly win, it was against his ingrained rules of reality, and yet, Trump won. So to him, this reality is just fundamentally flawed and broken, and it's killing him. The only way he could reconcile this is by treating this as the second act of storytelling, where the protagonists have to fight increasing odds, so he slips further and further into demented, radical thoughts of revenge.
On the other hand, he also thought he was already through his second act, with the struggles of his highschool bullying being the low point, and with Obama and then Hillary coming the time of redemption and reward for him. So he's currently raging impotently at reality not aligning with his vision.
Tl;dr Bob has some fundamental cognitive dissonance about reality and it's breaking his smooth brain.