The problem here is that being non-compliant isn't (and shouldn't be) forfeiture of your life. If the man were an actual threat to the police officer, eliminating the threat would be justifiable. In the video, we clearly see that the officer had no reason to fear for his life. Yes, the man tried to drive away to avoid arrest since he was clearly in violation of the law (this isn't in contention as far as I understand, though I could be mistaken), but the biggest issue here isn't that the man tried to avoid arrest, it's that the officer killed him when that course of action was not necessary at all.
I understand that people want to talk about the technicalities and argue that fully complying is more likely to result in a better outcome, but those technicalities really don't matter anymore because the man in the car is dead. Furthermore, while fully complying will probably result in a better outcome, it is the duty of the police officer not to abuse their position of power or lose their temper in such cases. There are ways to handle non-compliance that don't involve beating up or shooting a citizen.