ribit,
Lots of possibilities.  The gunman could be gay... could be muslim... could be a gay muslim.
(Heh.  Could be a Teamster.  How ironic would THAT be?)
There are more than enough sensitive groups to go around.  Trying to pick the right one at this point is bound for failure. 

Gold is $1,581/oz today. When it hits $2,000, it will be up 26.5%.  Let's see how long that takes. - De  3/11/2013 - ANSWER:  7 Years, 5 Months