You're missing the bigger picture, 8wop, the shooter was AMERICAN BORN, he was experiencing self-identity conflict, self-hatred, and severe mental illness.  The shooter could've easily met up with other extremists just like him and taken out a lot more of our citizens;  forty-nine innocent lives lost and for what?  President Obama is correct, it's going to be very difficult to identify Muslim extremists.  We are a nation founded on immigrants;  that's why we open our immigration doors.