You have to admire the gall of the logic that people come up with. "He was banned from owning any guns at all under some ordinance, so what possible law would have stopped him doing this?"
Also apparently., the bloke's Facebook profile pic was of an AR15, which sort of puts the whole right wing paranoia about "They're monitoring you trying to take your guns off you at the slightest excuse" in some perspective".
The whole paranoid right are suffering from collective butt hurt, having been scammed by a lone poster on twitter who had the whole of them fall for a totally fake "Antifa rising" on the 4th. They have been mercilessly taken to the cleaners over that one as have some MSM outlets who also fell for it hook line and sinker without making the briefest of checks which would have made it obvious it was a wind up.
It's not quite as bad as it all seems. Breitbart has had 90% of its' advertisers quit, the notable exceptions being guess who? You're right, Google and Amazon. Fox News take from ads is down 17%.