Also, the police use a different concept of operations, they go through many steps and procedures before they even unholster. They’ll negotiate for a peaceful ending and tend to be very reluctant to shoot, a good thing.
An armed citizen, though, can carry concealed and when the threat (punk with a baseball bat for instance) is presented, can draw and fire from concealment to protect his life, after determining that his life is truly at risk (OODA, Observe, Orient, Decide, Act).
Police injured with their own equipment is reported several times a year. Can you dig up an instance where a civilian is disarmed and shot with his own firearm?
A typical citizen will seek to get away and stay away from anyone they believe is dangerous. Police are often effectively required to get within contact distance of such people and try to apprehend them. It should not be surprising that they are at more risk of having their weapon stolen.
What I would like to see would be some instances where someone had his weapon stolen and used against him, in which neither the crook nor the victim was, or pretended to be, a police officer or government agent.