I think racial profiling has several drawbacks. The first one is that it has a lot of false negatives. It's not appropriate because it is indeed targeting many people who are not likely to be terrorists at all. So to start with, it's not efficient.
It also has the drawback of being what we despise the most about a society, which is to react to people based on the colour of their skin. This is completely inappropriate, so in a way we have to recognize that this has an unsavoury aspect to it. It's the wrong message to the passengers, it's the wrong message to the workers, and it's the wrong message to society. That would be the way in which I would start. It's inefficient and it's also an inappropriate message in a democracy.