I've heard this statement many times.
Last fall when I was talking to an officer in my driveway (yes, I was open carrying) about my FFL application and if he could finger print me, he noticed my sidearm and said to me, "you have a gun." I said yes I do......
At some point in our conversation, I said to him, you have a gun, why can't I have one? (something to that effect) and his response was "Well, I'm a trained police officer."
I thought that statement was a bit funny. In the late 80's, I went to college for law enforement and I rode with the officers of the Hastings, MN Police Dept. during my internship. I also participated in their dept. shoot both in June and July. I had never done that before and at the time I had a S&W model 686 revolver and no speed loaders. The course was the same for both months and it was timed. The first time (June shoot) I failed by 15 rounds. Surprisingly, some officers failed as well. The dept. shoot in July, again, the same course, same timing and the same gun without speed loaders, I passed and again, surprisingly, some officers failed.
Just because someone is a police officer and trained, doesn't necessarily mean they are good with a firearm!
I practice with every one of my firearms on a regular basis and I know I'm just as good with a firearm if not better, than any "trained" officer.
Tony