1. Costs: I think the value of preventing a terrorist attack greatly outweighs the $76/passenger cost of screening. Besides, it contributes a lot of value to the economy by (a) reducing the long lines we have in our airports today and (b) eliminating the unnecessary intrusive procedures
2. Racial profiling: Behavioral profiling is not the same as racial profiling. Besides do you really think that the low-paid unskilled TSA workers don't currently do any racial profiling ?