How do you know where they are from, what religion they are(aka how do you know if the person you stop fits your pattern)? Just by looks? What do you do with the rest of the people who don't fit your stats?
I would say looks would play the biggest role in identifying the majority of them. If you are trained professional you will know different regions of the worlds cultural norms and appearances. As ive already said 50 times. You will not catch them all. But stopping the Japanesse guy to screen him is a waste of time, money, and resources. Until such time comes that Japanesse people fit the bill of a terrorist. Well concidering most of the middle east is Muslim identifying the religious part will come with identifying the nationality part.
Again profiling is not a 100% fool proof thing. But its the best we got so we use it. People will always slip through the cracks or the whole pattern will shift and all a sudden Muslims stop terrorism and white male Russians start becoming terrorist. Or maybe both at the same time, who knows.
The point per the OP is wasting time on people who have no establised patterns of terrrorism. Which i agree with. People need to stop being so offended and pussy and look at the world with open eyes and seeing it for what it is and not what they want it to be. The day the world is the way you want it to be then you can pat yourself on the back for a job well done.
Profiling is not about racism etc. I dont care if its Muslims, orthodox Jews, Christians, 20 year old white male midgets or porn stars. etc. Its about patterns and attempting to make sense of them.