In general, I think there are a lot more shootings where people want to find fault with the cops (and shouldn't), than shootings where the cops are clearly in the wrong. A whole lot more, in fact.
But the particular shooting under discussion, so far, does not strike me as one of those. This one, unless accounts so far are way off, fails the smell test. Shooting officer left the scene, and did not return; victim taken to hospital in private car, not by EMS... If those turn out to be true facts, this is not good.