It seems the chief is supportive of the officers' actions and their shooting policy backs them up. Many departments, including mine, do not allow shooting at moving vehicles or even from moving vehicles. Even if I was allowed to, I personally would not have taken those shots only because I'm not confident in taking accurate shots while SAFELY maneuvering my own vehicle. If I was a partner in the passenger seat, then yea that's different and I'd be more comfortable in shooting at the suspects.
He did have the sense to close distance before he shot to lower the risk of stray bullets.
Common practice, as someone mentioned above, is to track and coordinate with an airship unit. But it really is a judgment call. The scum pieces of shits were driving very dangerously and firing away endangering officers and the public. And if it was known at the time that they were murder suspects, then you have a violent fleeing felon situation where immediate apprehension is paramount.
At the end of the day, officers weren't hurt and got to go home. 1 piece of shit dead to make the world a better place. The other piece of shit will die in prison hopefully. Overall result was good.