"Using your logic one could make the connection that the shootings in...."
Actually William, I do believe radical Islam was a likely factor in those shootings, along with mental instability, a weak ability to make moral decisions and the general climate of religious tension. 

" our lack of responsibility for the mentally ill walking our streets...."
I agree we need to do much more for our mentally ill, though I don't see where Christian could have been locked up and forced to receive treatment.
Personally, I've worked in the mental health field,  and know what a terribly difficult profession this is--- working Graveyard at Royal Avenue Shelter was the toughest job I ever had.