How do you know who the bad guys are? You either wait for them to do something bad, or you check and see if they have something bad with them, right?
In the so-called "war on terror," we know who the bad guys are. We would do well to secure our borders and stop immigration from Arab countries immediately and focus our efforts on the mosques in America.
One major problem we also have is the disintegration of our national identity and the flood of illegal aliens and other aliens who refuse to assimilate. We even have serious issues with anti-American sentiment in this nation among American citizens who have not been taught our correct history.
There is no easy answer, but dispensing with "politcal correctness" would be a good start.