We often catch real criminals in traffic stops. Sometimes people that have been on the run for years.
Ditto, and then some ...
Stopping vehicles for real traffic violations, even
annoying infractions, generally results in more criminals being located and arrested. I don't have to even work hard at remembering finding stolen vehicles, folks with outstanding arrest/bench warrants for drugs & violence, etc., etc. ...
One time a buddy of mine stopped a car on a rural highway for a minor traffic violation and apprehended a seriously dangerous person wanted for kidnaping in another state. He had a cocked revolver sitting on the front seat, covered and concealed with some cloth.
I remember when I was training new people, and all we had to do to get them more self-initiated arrests each shift ... to add to their dispatched "go arrest someone at the following crime scene" arrests ... was to stop more moving vehicles.
I always gave more warnings than tickets, unless I was working a special detail because of public complaints of certain violations ... and I never had a hard time finding and arresting actual criminals behind the wheel of a car, or as a passenger. It used to really puzzle some of the 'less proactive' folks, too, especially since one of the beats where I used to find and arrest real criminals in cars was a rather affluent area ... which just happened to have a few freeway exits and entrances that made it convenient for criminals to pass through, or stop and browse, apparently considering some "easy" criminal activity with handy freeways escapes ... and violating various rules of the road in the process.
Of course, if people want less traffic enforcement ... they should probably be prepared for more traffic accidents/collisions, including those involving injuries/death, and more criminals being active and mobile, feeling free to move about without worrying about getting caught while driving to & from their nefarious deeds.