Not the cleverest move
They've got it arse-about. They should assume it's not real until they have a reason to believe it is.
I.e. until he shoots someone? Then it's too late and "why didn't you stop him sooner" witchhunt begins.
I'm 90% certain these "cosplay" guys wearing gas masks and bulletproof vests know exactly what they are doing. And are either passive-aggressive imbeciles or just "testing the waters". If noone gets scandalized, they go for more.
So fuck them.
Reminds me on Uwe Boll's "Rampage": http://www.imdb.com/title/tt1337057/
Good movie with a good twist at the end.
What was he doing that was illegal? Is there a law in Canada against wearing cosplay in public?
This article has a higher resolution photo of the guy's costume.
Io nailed it. This guy knew what he was doing. He did it hoping to go viral and get his 15 minutes.