In principle I'm for some sort of profiling system. But... as long as the refusal to remove one's shoes doesn't constitute "suspicious behavior" alone then it may be ok.

Is it possible to train all TSA'ers to consistenly correctly profile somebody? Profiling is not an exact sicent to begin with. I've met some fairly intelligent and nice TSA'ers but I doubt in an organization that large that a majority of the employees could easily be trained up to a level to make this truly effective. But if all they do is refer suspicious persons to a LEO that may be ok. We'll have to see how this works out.

The biggest thing is communicating a standard as to what is suspicious.