I've watched the show three or four times. There's another episode in which Shatner's character shoots a man attacking a colleague. It plays out in the same sort of way. Portrayed conservatives as a little eccentric, or maybe a little backward, but it's true we're backward. In a good way.
I think it's carefully planned enough that liberals will think it's an anti-NRA joke, and conservatives will see it as a pro-NRA joke.
Either way it's funny.