one-eyed fat man's Journal
How many times do the cops kill an innocent person?
Man Dies in Police Raid on Wrong House
Menlo Park police raid wrong home, residents say
Police raid wrong house, hold circuit court judge at gunpoint
Pearl Family Suing After Police Raid Wrong Home
Police raid wrong house, gun pulled on 13-year-old child
D.C. Police Raid Wrong Home, City Refuses to Pay for Damage
*About 1,320,000 results (0.07 seconds)
"...And when it's Gun Guy against the cops, I doubt the Gun Guy will walk away from it on his own two feet."
As one quick example to the contrary, police serving a search warrant raided the house of 58 year old Charles Degustine in Florida in the middle of the night. (It turned out they simply raided the wrong address)
They threw in a flashbang grenade to disorient the occupants first, then charged in. DeGustine grabbed his handgun and fired at the officers, killing one. He was charged with murder of a police officer, and acquitted on the grounds of self defense.
In another midnight raid, Steven Shively of Topeka awoke to find armed men prying down his door. He called 911 and reported the attack in progress. As they tried to get the door open, he grabbed his gun and fired a single shot through the gap they had opened, killing an officer. He too was acquitted of murder charges on the grounds of self defense.
Note that in both these cases, the police were not even engaging in deliberate misconduct when they were killed. In one case they were simply at the wrong address, and in the other they had bad information from an informant. In both cases, the defense successfully argued that the defendants had no reason to expect themselves to be the target of a military style SWAT raid in the middle of the night, and were therefore justified in believing that they were the subjects of a robbery attempt, and were justified in using deadly force.
In the Shively case, the officers never identified themselves as officers before the shooting as they were trying to get the door down before waking the occupant. In Florida, they were yelling "Police" and wearing marked vests as they charged in, but testimony established that the flashbang grenade would have deafened the elderly occupant, and disoriented him to a level where he could not have been expected to read and understand vest markings in a dark room full of heavily armed shouting intruders.
...and a couple more.
Man Acquitted of Killing Officer
Quebec man acquitted in police officer slaying