Rational anxiety is when you're aware of the source of your anxiety. Like, if I have to host an award show or talk to millions of people on the radio, I'm going to feel anxious, and I know why. Irrational anxiety is when I'm leaving CVS, and there's a car behind me, and I'm wondering if he's following me home.
If stop-and-frisk was a fair and balanced practice that targeted everybody equally across the board, then I could understand the extra precautions being taken, but since it's a practice that targets blacks and Hispanics and gives the police the right to lawfully profile us, I'm not with it.