It's true that a lot of LEO's don't practice/train as much as they should. It's also true that even more CCW holders don't practice. This incident should serve as a chilling reminder not only to train more, but also try to avoid trouble in the first place. When I took some self defense lessons years ago (martial art, unarmed), one thing the instructor instilled in us was the very real and likely possibility that your adversary might be better than you.
I've taken a one day basic pistol course as well as a four day defensive handgun course. I do not consider myself an expert by any stretch of the word. However, taking a course specifically focusing on defensive tactics made me realize how ill prepared I was beforehand, and how thankful I was that I haven't been involved in any gunfight encounters (which I most likely would have lost).
The number one problem with training, I think, is the mentality that a lot of gun owners have, especially males--"I know how to shoot. I don't need to train." Usually these folks have not been in any kind of situation that called for use of force. I can't tell you how many times I hear that from the armchair commando types that I know. They are the ones that criticize the credentials of everybody else, yet seem to have no credentials of their own, yet talk like they're the foremost authorities.
I think the next problem is, as someone else mentioned it, that most ranges don't allow defensive training, for insurance reasons. I see why public ranges would not want someone they can't control shooting himself in the leg while trying to draw, or firing up at the ceiling or down at the floor because someone pulled the trigger too soon. I can sympathize with that. But the fact remains that defensive shooting training is limited, outside of expensive training facilities that a lot of people can't afford, or are so far away.