"Sir... step over here..."
Mental illness is prevelant in our society, but people can be in fear of confronting or addressing those people, and so such people sometimes do lot of damage...
Portland Maine ticket agent that checked in the men whom would later that day, fly a plane into the world trade center, sensed Atta fit the profile of a terrorist. His "gut" was right. The agent indicates signs that could have been used to pull them aside, and check the situation more thoroughly...
if it wasn't for political correctness... and "procedures". In a world of freedom... ya don't let crazy people on your plane, or in your house, or school.
Discrimination isn't just cultural, it's emotional. Looking at another person and determining "something is wrong", or further evaluation is required... many can do that. But it can look discriminatory to those whom have been discriminated against unfairly. It's a tradeoff... your freedom for potential safety.