So if you say "**** you, you Nazi skinhead", is that "provoking" behavior? Was ramming your car and then backing over the people you just ran over an appropriate response to any provocation?
And to answer your question: in a broad sense -
no. Absolutely
not an appropriate response.
However, we do not know the details yet. Was this man assaulted before getting into his car and ramming over people? In that case -
yes. A mob of people assaulting you legally justifies you to respond with lethal force.
We need to wait for the clear, full details before passing judgement.