I would not be bothered with things like that. When people see me, they have a bit of a similar issue: "what in tarnation is that guy doing?" when I am simply too cheap to buy an mp3-player, and thus perform songs in memory.
I would not be surprised if there is a Pizza-Bomber in the US,
, murder and such are barely a problem here. So even less reason for people to think there might be a problem. I think most people here would be drawn to such a figure, to be honest.