I rephrased the question you should be asking...
"So it legal to shoot someone for driving at another car?"
In some states, yes it is. In Florida it is called "using deadly force to prevent a forcible felony". And driving directly at another car with someone inside it may cause great bodily harm or death, which is a forcible felony.
If this were legal nearly every police chase with cops firing into the back of a fleeing vehicle.Bottom line when they were shooting at the back of his fleeing car he was not a threat to anyone.