If I were trying to advance a right-wing agenda & was going to go after a mainstream white male "liberal" show host to put fear into critics of the regime, I would probably go for, I dunno...John Oliver, someone who actually puts forward substantive & persuasive content.
I would worry about how a guy like him sways public opinion a lot more than Jimmy Kimmel.
But this isn't a campaign against "the left". This is Trump getting petty revenge on a guy who makes him feel small.