David Frum was the original Metrocon. The Platonic ideal. If you looked up Metrocon in the dictionary you'd see a picture of Frum there. The conservative intellectual from an urban area that is for gun-control because of their upbringing. Only cops and robbers in 'his' world have and use firearms. And since he is neither of those...
Except now Frum is not so conservative and hasn't been for years.
He's been a bit of a nobody, which is probably why he tweets such outrage. To draw attention to himself. And here I am obliging him. So it must be working.