You need to get up to speed. The TSA is operating at many public places now not just airports. The ‘safety’ philosophy IS spreading. Also the police don’t arrest ‘criminals’, they arrest suspects. Again, according to your logic, if the authorities were to ‘stop and frisk’ twice, three, four times as many people would they not be taking more potential ‘criminals’ out of circulation? The theoretical logical conclusion being if everyone was suspected and frisked, crime could become almost nonexistent. Maybe NYC needs to add some additional taxes and hire more law enforcement in order to really bring the crime rate way down. That little thing about unreasonable search and seizure is just so passe.....
That 20% number represents criminals:
According to NYPD statistics, almost one in five stopped were guilty of a crime.[3] The vast majority of these people were African-American or Latino.[1][3][4]
The Obama DOJ is stepping all over NYC probably because too many black and Hispanic criminals are being picked up.