OTOH, maybe this guy did do something illegal
That is why, in the end, confiscation will work. The first assumption will be that the guy is guilty or they wouldn't have gone after him. There must certainly be more to the story than we know. And later, when the press releases "the rest of the story", we'll all take them at their word and feel safer with the dirtbag (this one or any future one) disarmed and off the street.