I would urge everybody to keep level heads about them as they engage in discussion. You can make your points without resorting to hyperbole, personal attacks, ad hominems, and other fallacies.
But, more on-topic, maybe we need a split, I don't know. Or a lock, whichever. 
Well, the opening post was specifically about the level of force police use when responding to threats. So the other posts appear to be on topic. If you wanted to compare ammunition caliber, or capacity, or various firearms for hunting or shooting practice, that would be better served by starting a new thread.
You appear to have addressed the issue I was referring to.
EDIT:
And, yes, this thread was about ammunition amounts & calibers. Hence tactics in the thread title. Police brutality isn't a tactic; it's a crime and should be treated as such. Heck, if you did some of the things mentioned here as a soldier in Afghanistan you'd probably be in some (understatement there, don't miss it) hot water (court martial), I don't know how civil servants get away with it here in the CONUS when there's evidence to back up what happened. Just corruption in the justice system I would say.
But, referring to the OP, some here seem to advocate just rolling over and "oh, well, you know, if I can't stop a crook from shooting at me, at least it wasn't my fault that he did 'cause I'm as helpless as a cute little kitty cat" -- really, officers do need to be ready to inflict deadly harm. As long as they don't respond with inappropriate levels of force, they should be equipped to respond to anything that they might face in their area, and maybe a step or two above. That's my thoughts. I mean, if you have a couple of hardened criminals in a fortified house, you could either:
1) Spend all day plinking at them with handguns
2) Spend hours sniping with semi-auto rifles
3) Spend a few minutes with a grenade launcher
(Although, to get to #3, that's probably in SWAT territory, however, that increases your time of regular arms fire exchange, and the resulting probabilities that bystanders or responding officers will be hit.)
Anyone here watch 44 minutes?