Your second point is well taken, but your first is overreaching. He's not suggesting libertarianism is lunacy. He's suggesting that the interpretation of libertarianism that requires random people on the street to be better documented than guns is lunatic.

It seems clear that reasonable people can take either side of that argument, but the argument is reasonable only to the extent that it doesn't get reframed as "Christopher Dickey versus the Concept of Libertarianism".