This "behavioral profiling" is a great end-run around the pc bs of "racial profiling". People who strap bombs on and then detonate themselves in crowded places - behavioral profiling / muslims? doesn't matter. Sounds like a step forward to me.
When I visit DC and ride Metro I hope I don't look suspicious. I am always a little wary about security so I might appear to be a bit nervous. Plus sometimes I get impatient waiting for the train so I pace up and down. But I am quite harmless. :)