STO
Like I said, cops are human. You can't expect them to act like Mr. Spock and always be logical and perfectly fair. Life is not fair.  
I was mistaken for a burglary suspect years ago as my truck fit the description. I was very nervous but quiet and answered all the questions I was asked. Kept my hands on the steering wheel the whole time. I did not resist, was respectful and was allowed to go when he saw I could not possibly have been the suspect they were looking for.  The cops are  doing an investigative job and the last thing they need is antagonistic people enraged that they are ever questioned for  a crime.  In fact that behavior and 'running' usually implies guilt. Cops, in general,  do not 'murder' people.

 I do not  support vigilante's. The 2 good Samaritans down in Portland OR who were knifed to death on the light rail should not have intervened, but called the cops while possibly  trying to distract the 'nut' who was being  verbally abusive to a couple of Muslim women.