So EVERYONE is a potential ‘criminal’ therefore all need to be frisked just to be sure they aren’t? That would be the logical conclusion of your reasoning. Spreading the TSA philosophy to all the public no matter where they are....
I don't see where you get the "everyone". The TSA doesn't frisk "everyone" - just people who are about to get on board the 400 ton missiles we call commercial airplanes, next to which a 1 ton JDAM is a pinprick.
Public safety departments - even one as large as the NYPD - don't have unlimited resources. If they abuse their power, we can force them out of office and even put them in prison. That's why we have elections - so we can put our collective foot down. 20% is a huge success rate. It represents over 100,000 arrests of actual criminals.