Given the number of crimes solved by this tactic, I think the police are choosing something that has tangible benefits to the community. If they have a legitimate - albeit minor - reason to pull you over, they're well within their rights to do so, and very often it results in catching someone doing something much worse. Maybe it's annoying to get pulled over for something minor, but I consider it far more annoying to deal with all the petty crime we suffer, and the police using a fruitful tactic to cut down on that stuff is just fine by me.
So if you don't want to get pulled over, obey the law including all the particulars for vehicle condition.
Which other amendments to the Constitution do you believe we should just ignore if it serves the goal of lowering petty crime ?