I grant that the joke that he's making is an incredibly poor taste, and I would probably critique him for that, but to pretend this clip has anything to do with his positions on gun control is a brazen act of intellectual dishonesty. Alex is confident he can pass it off because his audience, he knows, won't carefully listen to that, and they'll just assume Clarkson and Trini are gun lovers in the UK or something like that. If Alex were operating from a sincere position, he would never try to pass off this kind of manipulation on his audience. This is deeply intentional.