You know why we are there? Because some other tax payer called and complained about the traffic at that intersection/roadway. Someone's daughter/wife/son almost got hit there and they want something done.
What does expired plate or no seatbelt have to do with any of what you just said...? Nobody minds if you're there...be there...! If your visible presence there will make a dangerous intersection safer, then be there. But extorting money from working people/taxpayers isn'takinh anything safer. It's just making those people in particular dislike cops in general because of the ones that gitem said see it as the whole scope of their job to enforce traffic laws.
