By your logic, someone would be just as correct if they said that they 'could' be causing 20-30 more shootings by their regular abuses of power.
Regarding traffic stops -- they are not effective for preventing other crimes, especially in light of the biases of LE:
"A study in Arizona shows that during 2006-2007, the state highway patrol was significantly more likely to stop African Americans and Hispanics than Whites on all the highways studied, while Native Americans and persons of Middle Eastern descent were more likely to be stopped on nearly all the highways studied. The highway patrol was 3.5 times more likely to search a stopped Native American than a White, and 2.5 times more likely to search a stopped African American or Hispanic.
The Arizona study also shows that racial profiling is
counterproductive and a misallocation of scarce law enforcement resources. Although Native Americans, Hispanics, Middle Easterners, and Asians were far more likely to be stopped and searched than Whites on Arizona's highways, Whites who were searched were more likely to be transporting drugs, guns, or other contraband. While African Americans were twice as likely as Whites to be stopped and searched, the rates of contraband seizures for the two groups were comparable."
http://www.civilrights.org/publicat...acial.html?referrer=https://www.google.co.uk/
Here are some examples to counter the above article:
Traffic stops regularly result in criminal arrests, drug interdiction, and criminal investigations. Some traffic stops are world renowned. For example, the Oklahoma City bombing suspect, Timothy McVeigh, was apprehended by an Oklahoma State Trooper while making a "routine" traffic stop. Serial murderer Ted Bundy, who killed over 22 women, and the Atlanta child killer, Wayne Williams, who killed 28, were also apprehended because of traffic stops. "Son of Sam," David Berkowitz, who killed 6 and wounded 7, was captured because of a parking ticket.
While not necessarily making national news, police officers and sheriff's deputies make hundreds of traffic stops every day that result in criminal apprehensions, directly affecting the security and safety of communities across the country. There are many examples of the agencies and officers who make this a regular part of their job. The following illustrate some examples.
Doña Ana County Sheriff's Department, New Mexico
Sheriff's Deputy Kenneth Wooten initiated a traffic stop for speeding (86 mph in 65 mph zone). The violator, later identified as a convicted felon, became increasingly nervous as the deputy talked to him. Deputy Wooten called criminal investigators and the Bureau of Alcohol, Tobacco and Firearms to assist. A search of the vehicle revealed several weapons with the serial numbers removed. The weapons were confiscated, and it was determined they were stolen during a burglary. Deputy Wooten's actions to issue a speeding ticket removed dangerous weapons from the hands of a convicted felon, thus possibly preventing further violent crimes from being committed.
California Highway Patrol
Officer Les Knapp stopped a truck for an expired Arizona registration. The female driver and male passenger were unable to produce current registration information for the vehicle. A vehicle identification number check revealed the truck had been taken in Arizona during a homicide three days prior to the stop. Descriptions of a couple wanted in connection with the murder matched the descriptions of the vehicle occupants Officer Knapp had stopped. Officer Knapp placed both subjects under arrest for auto theft, receiving stolen property, and homicide. After questioning, the couple eventually admitted involvement in the homicide. Arizona authorities extradited them to face charges. Officer Knapp has made other "looking beyond the ticket" stops and says catching criminals is simply "part of his job."
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Colorado State Patrol
Trooper Timothy Marnell stopped a vehicle for a speeding violation. The driver, who did not have any identification, was later identified as a wanted and extremely dangerous fugitive. The subject was looking for papers in the vehicle when Trooper Marnell noticed he was reaching under his jacket. Trooper Marnell felt he was in danger, drew his weapon and directed the occupant from the vehicle. Without backup, Marnell took the subject into custody. The subject was carrying a semi-automatic handgun in a shoulder holster under his jacket and two illegal knives. He had a sawed-off shotgun under a sleeping bag on the front seat of the vehicle. The subject was an escaped felon from a Utah correctional facility with convictions for murder, armed robbery, and attempted murder of a police officer. Trooper Marnell had no idea how this speeding violation would turn out when he decided to stop the vehicle. His initiative and attention to cues "beyond the ticket" resulted in a significant arrest and contributed to his own personal safety.
http://www.nhtsa.gov/people/injury/enforce/Beyond/percept.htm