@edgarblythe,
Anyone under constant threat from firearms is going to be trigger happy. If that is the environment you work it - it will shape / influence you and how you do things while in that environment. So I agree that free carry creates an environmental issue that is likely to lead to more shootings by police.
Each incident should always be judged on its own merits. Only after it is judged on its own merits can it truly become elligible for discussion of wider patterns (otherwise you can't tell where it fits and if it properly belongs).
I watched that video, and it seemed absolutely bizarre to me that the guy with the gun didn't put his gun on the ground way earlier, put his hands in the air way earlier etc. It seems absolutely bizarre that he didn't look in the cops direction etc. Given the informantion they received on the way there, his weapon and his behaviour, I can't say in that split second, that I wouldn't have feared for the life of the fellow in the driver seat.
That said, if their directions to put the gun down was going to result in him getting shot purely from the movement of putting the gun down - then their communication was ****. At the same time, I'd not be surprised by tunnel vision / fixation on the most dangerous issue...but that is also what training is for. Then again, the amount of training that would be required to overcome many/most peoples instincts (focus on the threat) would be fairly extreme (by sheer nature of how much practice it takes to overcome instinct/ingrained habit in high stress situations). If you take cops off the road for as long as I guess it would take each year to ensure their communication is good in such situation...there'd need to be a lot more police officers. Sadly, this type of argument/rationale seems to come down, again, to budget issues.
Most of the other things I've seen on this thread have horrified me. This one, I think I understand.