There are likely to be exceptions of the moment. But when it comes to broad policy or even tactics that allow for some consideration before using them, the question of how to build trust and rapport with the community in question should always play a major role in police decisions. When that doesn't happen, we get the last week in Ferguson, MO.
(To keep that British theme, here some additional interesting statistics comparing US vs UK police shootings: http://fivethirtyeight.com/datalab/police-in-england-and-wales-went-two-years-without-fatally-shooting-someone/; it's obvious, of course, that there's a difference between the US and the UK, but I wonder how much of that difference is amenable to change.)
The 9 Principles of Good Policing
The foundations of a civilized law-enforcement agency—and a veteran LAPD officer whose attitudes are at odds with them