I say this as someone who has spent a fair amount of time around LEO's from the local level up through the FBI, the US Border Patrol, and the Secret Service.
The world these officers exist in today is totally different than the one their predecessors dealt with while carrying a six shot S&W revolver and a shotgun in the trunk of their patrol car thirty years ago. Even a modern officer, wearing a Level IIA bulletproof vest, carrying a .40cal semi-automatic pistol, and having a shotgun and carbine in the trunk of his cruiser is still often going to be outgunned and out-equipped by the criminals that he has to deal with on a daily basis.
More importantly, in our increasingly litigous society, that officer's training with those firearms is not likely to be what it should be unless he/she goes out of their way to get private training off-hours and at their own expense. The CT State Police Academy (as of 2003) included 5 days of firearms training in a 14 week training schedule. How can any officer be expected to become competent with a firearm in that period of time? More importantly, these officers are given these tools and then told that if they ever use them, they're likely to be suspended without pay, thrown under the bus by their department, and quite often lose their jobs in the end. We give them a tool, don't teach them how to properly use it, and then tell them we're going to discipline them if they use it incorrectly. That's a great help.
What we need is essentially a "Top Gun" of "Red Flag"for LEO's.... somewhere that they can go to learn the Art and Science of the Gunfight so that they can learn how to avoid the need to discharge that firearm, but also how to be sure that they're the one who survives IF it comes to needing to do so.