Your reasoning and responses are comical.
They might be comical to you, but they're a matter of life-and-death in NYC, which brought its aggravated assault and murder rates down mainly on the strength of this type of enforcement. I'd prefer laxer enforcement and an automatic death penalty for murder and multi-decade prison terms for aggravated assault. But this is NYC, and stop-and-frisk is a consolation prize for people who want safe streets.