Wearing a shark costume while quoting a senator seemed sweet and suburban. Maybe that was the point of the silly costumes: It was a small island of old norms within a national emergency. There were a small number of scowling dudes bullhorning loudly about their love of communism, as the First Amendment entitles them to do. But most of the other Chicagoans exercised their right to amble on by in, for example, inflatable corn costumes, without so much as a nod in the dudes’ direction.