Wrong. It was one of your fellow libertarians who declared traffic stops a "Constitutional crisis."
Until the automobile, there were no traffic laws and yet there was plenty of traffic. In most states the power of police are predicated on a signed affidafit by another citizen before you can be arrested.
A traffic stop is an arrest and some do believe that this is a suspension of the common law right of travel. I agree but have never said anything about any justification of this particular event. There isn't enough information to draw a conclusion one way or the other yet I notice that you and others like you are quick to condemn the civilian even though it isn't even clear whether or not it was he who inflicted the fatal wounds.
The Supreme Court has ruled that your right of self-defense indeed extends to the killing of cops who are acting outside their authority. If you have a beef, perhaps it is with the Supreme Court and the constitution itself. That does seem to be a pattern with you.