This is not how I remember the micheal brown shooting. From wiki

[kristopher]

115. From 'minimum force' to 'Unleashing the Warrior Spirit'

Law enforcement officers should use only the amount of force necessary to mitigate an incident, make an arrest, or protect themselves or others from harm. The levels, or continuum, of force police use include basic verbal and physical restraint, less-lethal force, and lethal force.

http://www.nij.gov/topics/law-enforcement/officer-safety/use-of-force/pages/welcome.aspx

Unleashing the Warrior Spirit
There are times when a cop’s best defense is a good offense.

<snip>
There needs to be more-much more. There should also be a mindset that is taught to every officer about how to go from the defensive to the offensive. You need to know how to release the beast from within in order to survive and win. There's a time to talk and a time to fight. There are times when your nice guy Mr. Rogers community-policing personality needs to be replaced by Godzilla.

Mindset is important for any officer. The ability to change from prey to predator can save you from bodily harm or even death. When the time is right, you must know how to draw from within and understand that the will to win and survive isn't just a nice attribute, but a critical one.

Law enforcement critics may say that offensive training can turn officers into goons and thugs. That's true, if you don't know when and where to shift from the defensive mindset to the offensive mindset. You can become a bully. And that's bad. But not being able to make the shift to the offensive when you need to can turn you into a hospital patient or a corpse, and that's worse.

Further, your ethics and knowledge of criminal law will help you decide when to go into an offensive mode. Your training and experience are used as the filtering mechanism in deciding when to go offensive....

http://www.policemag.com/channel/patrol/articles/2003/03/guest-editorial.aspx


Note in particular this paragraph where the life of the officer is valued above the life of innocents. Yes, that is what it says:

Law enforcement critics may say that offensive training can turn officers into goons and thugs. That's true, if you don't know when and where to shift from the defensive mindset to the offensive mindset. You can become a bully. And that's bad. But not being able to make the shift to the offensive when you need to can turn you into a hospital patient or a corpse, and that's worse.

To not be a goon or thug, requires the knowledge to shift.
It makes one a "bully".
That is bad.
"BUT"
Not being able to do it when you need it is worse than the potential for creating thugs, goons, and bullies and inflicting their behavior on an innocent public.