The rate of military wanting to join the police force (through "green to blue" programs coupled with the amount who pass the academy and are sworn in.. (its a very difficult figure to get here on the internet... but its around 10-20%) That's pretty insignificant to begin with because they are barely even hired to begin with.
With that, it is safe to say it is mostly the police with no prior military experience who do the ugly stuff we here on the news. Its also important to understand the difference between experience and training. Experience is to actually use it in the field and then have the opportunity to assess yourself along with your peers in a concrete manner.
On the subject of race. Many of the peers those encounter mind you are of different races and you don't have the freedom to live anywhere you please (side note: the demographics of US military are not equivalent to the US civilian population..40% minorities as opposed to 28%) So, good luck being racist in the military) Once again, its more likely race card cases involving police have not an Ex-military member involved.
I think you will find that most of the time these police are simply bullies who may be too racist, or scared of real combat to join and are itching for a safe yet, real world scenario to get their rocks off. (Situations that a very rarely get and the military does: more than it wants. PTSD anyone?) All in all i think it's quite the opposite from your call to fire ex-military from the police forces and quite the contrary. Police officers should BE REQUIRED military experience or (at a minimal military training sponsorship) for a significant period of time because there is way too much room for them to be zealous, scared of people and lack discipline with any weapons they carry.
= new reply since forum marked as read