I heard douchenozzle Congresscritter Peter King advocating "profiling" over the weekend. He meant ethnic or racial profiling and lamented that "political correctness" stood in the way. Actually, it's the utter ineffectiveness of that kind of profiling that stands in the way of its being deployed.
Besides, what categories of people should be subject to extra scrutiny to deter terrorism? Irishmen and Roman Catholics of all nationalities since the Oklahoma City bomber and the abortion clinic bombers were Catholic and because members of the IRA were Irish? Nigerians and, since Nigerians don't look much different from other Africans, other Africans? Swarthy Arabian or South Asian looking folks and anyione who looks like them such as Israelites and some Hispanics? Basques and anyine who looks Basque, i.e. Europeans and those of European descent?
I guess the Chinese, Japanese and Koreans needn't be looked at too carefully. Everyone else will get enhanced security and surveillance.
Profiling, to work, has to be predicated on meaningful characteristics, not on race or ethnicity. The proportion of malefactors of a particular race or ethnicity to the total membership in the category is so miniscule that race and ethnicity are useless for profiling.