Firstly, laws that are not enforced are not laws at all. If traffic laws are not enforced, how many more people will die because of drivers behaving recklessly? Some jurisdictions are, I have read, experimenting with having traffic laws enforced by a specialized force that does not carry firearms or have arrest powers, they just write tickets.
Secondly, Duante Wright was not being arrested due to an expired tag or an air freshener hanging from his rear view mirror. He was being arrested due to a warrant that was issued when he failed to appear in court to answer charges of assault using a firearm, following an incident where he (allegedly) choked a woman, threatened her with a handgun, and searched her including groping into her bra looking for money he thought he was owed. Should the police not enforce arrest warrants either? Why would anyone show up in court at their arraignment if they know the police won't enforce warrants?
It's not clear that Officer Potter was aware of this at the time (and so it might or might not be germane to the incident), but Duante Wright had a firearm in his possession at the time of the stop, which would have resulted in felony charges due to his status as a felon. Likely that played into his decision to resist arrest and flee. Certainly Mr. Wright did not deserve to die for these infractions. However his actions contributed a lot to instigating and inflaming the situation.
So again, how are things supposed to work if we adopt a policy that traffic laws and arrest warrants are not to be enforced?