Form, stopping and frisking takes but three or four minutes of one's time. What reasonable person equates giving up four minutes of his time with "breach of his essential liberties" or "police state"?
I would say you quite clearly have no idea what "police state" is... if not for the fact that in number of incarcerated persons, US has apparently already surpassed USSR in its better days.
Your ridiculously, incomprehensibly draconian penal policies have already created a police state. For instance, a story from The Economist:
Things like this are why US has long been on the top of my "countries to stay the hell away from" list.
And why is that? Probably not least because people like yourself are clinging to ridiculous, dated, overfetishized constitution and nonsensically strict interpretation of its 4th amendment.
For God's sake, the very fact that you have a misdemeanor called "loitering" (seriously, WTH?) means you have long since gone to the other side.
American idea of protection of civil liberties:
1) Adopt 4th amendment.
2) Apply ridiculously strict interpretation;
3) Realize this hinders normal police work;
4) Invent a "misdemeanor" that everybody can always be accused of, to have "reasonable cause" to stop and search them anyway;
5) Slap on a punishment like up to a year in jail for good measure;
6) Profit???
In a word, stop and frisk isn't danger to one's rights. Most everything else in your law enforcement seems to be. But I guess I might cling to this last line of defense too, if the penal system worked here as it does in US.