Before you're so quick to think you can solve this problem by profiling every person with brown skin, maybe you should consider all the other holes that exist in the security process?
As of now, I believe it would be very easy for a baggage handler or other airport security staff to load a bomb on a bag, or onto a plane some other way. The fluid ban? Funny that it only applied to passengers. How come no one was checking airport and airline employees beverages to make sure they didn't have liquid explosives?
The problems run far deeper than someone trying to sneak a box cutter or bottle of explosives through a security checkpoint. In fact, there're much easier ways to complete said objective, and anyone who doesn't consider the alternative is a foolish terrorist.
Don't underestimate terrorists. If they want to get explosives or weapons on a plane, there're already ways to get them on there unchecked. Maybe the next big 'terror ring bust' will simply be a diversion to get these dangerous materials on in another way unchecked.
It almost seems to me that all the terrorists we've been catching are of the short-bus variety. Extremely expendable, just like suicide bombers, and the terrorists are testing the waters.
Profiling will simply increase tensions and hatred for us in general. It will solve nothing. I'm almost 100% positive that our current security checks will just weed out the dumb one's with no professional connections.