I would submit there is a difference between a discussion about tactics and armchair quarterbacking.
The armchair quarterback, from the comfort of the aforementioned armchair and from behind the safety of the screen, after being able to review all of the facts of the case multiple times, and with 20/20 hindsight, implies the right (or wrong) choice in any given circumstance was obvious, take command of the term "should have", and suggests that had they been there, everything would have been fantastic.
A tactical discussion, while it can sometimes take entire situations into account, focuses more on specific circumstances, factors, and mindsets, discussions possible problems and repercussions, alternative solutions, and how one might train to be able to actually apply these lessons in real life situations where things are tense, uncertain, and rapidly evolving.
While I've tried to leave police tactics out of this since they would be difficult to apply, the discussion might include such things as the fact that the precision immobilization technique (P.I.T.) is a maneuver not generally trained to every officer in several large cities, and only PIT certified Officers may perform a PIT. A PIT performed by a non certified Officer is called ramming someone, and although I believe this would have been an appropriate course of action, if not the best, many departments expressly prohibit it, removing that concept from the spectrum altogether for the educated Officer who knows their departments policies.
Other discussion points of police tactics could include the deployment of stop sticks, the availability of long guns, K9, helicopter, ETC.
I just tire of hearing "he's a hero" when things go right, and "he's a murderer" or "he's a coward" when they don't. It's never that simple. It's not a question of whether the actions taken were perfect, it's a matter of whether or not they were objectively reasonable in light of the facts and circumstances as known at the time.
Again, I have zero problems with honest tactical discussion. Things can always go better and should, I just try to refrain from casting judgement on those who were acting to the best of their knowledge, training, and ability, regardless of what the outcome may be.