It's not an uncommon sentiment on the left. The phrase you'll hear repeated is that JFK's death was due to the "climate of hatred" in Texas and the southern US at large. Because, you see, it was the mood of one of the South's biggest cities that blew his head off, not a scrawny little Commie who was such a loser the Soviet embassy sent him away laughing about him.
I try not to attribute Bob's asshole positions to the greater Left, not because I agree with them but because I think it's unfair, but there are times you can't get away from the fact that he does gravitate toward their most absurd extremes in a way that isn't too distinct from less exceptional individuals. Considering the whole Wasteland Ghouls attitude, I have no doubt he buys into the "climate of hatred" silliness unreservedly.