We paint with a big brush in America. JAG's point about mental illness may be that If we scapegoat that problem to absolve guns in our culture, then the very sniff of a mental issue may end up resulting in gun confiscation from those who are no danger whatsoever to society.
Consider the move to brand the soldiers who leave the military for psych problems as dangerous. I can easily foresee "reasonable gun control" used to strip the elderly who may appoint a power of attorney of their second amendment rights.
There's a guy I often fly with to Canada in the Fall who brings his Labrador Retriever on the plane with him and in a seat in the cabin. The dog has a shoulder harness like a service dog and a sign on it says 'emotional support animal' or something like that.
Of course the Lab is just his retriever and the guy's dressed in camo, so you know its a dodge. I often wonder what he's going to think when Canada decides he's really a nutcase and takes his shotgun and kicks him out of the Country....Geo
