Until that logic is broken the Police, collectively and individually, will not change their attitude. As i have recommended before I think each police officer, including desk pounders, need to have a personal bond to pay for their over reactions. The bonding process would cover something like this plus dog shootings but not cases brought by felons.
Or it will drive their pay way up to attract people willing to take that risk.
Our military isn't subject to many of the same international laws as other militaries for this very reason.
Personally I'd like to have it where if a cop commits a criminal offense he gets at least twice the maximum sentence. My reasoning is it's often harder to convict a cop so they need a bigger deterrent to committing crimes.