It's been commented on before, by serving LEO's and retired, that officers get minimal training and even less reinforcement.
As a retired serviceman who did train Infantry and MP, I can say the exact same about the military. "Shooters" by and large get enough training to be safe, in general terms, but not necessarily proficient, and it's based on the average student's capacity. If we are looking to get every soldier and LEO to the 95% level then it's not going to happen. One major reason is that we simply can't afford the expense - for some, nothing else would be getting done for months at a time.
Humans have different capacities for the skills necessary - same as race drivers, carpenters, or astronauts. Some can take in a lot and then practice high levels of skills in a short duration, others require a lifetime of work experience to absorb the more subtle requirements. It's because each human is unique and only capable of what it can do. We are not able to conform to a learning curve imposed by time-cost considerations. If anything some who have flunked out could have been better at it - and others who pass the entrance exams never improve after that.
You want perfect cops then you pay the piper. Expect the price to at least double, if not triple. Cops mishandle guns? Sure. They are NOT "experts," any more than the average computer user could step in to an IT position at a Fortune 500 company. Much could be said about the average poster, too. We can handle guns well enough to keep from shooting ourselves and our family, but as the Good Samaritan demonstrated at the Utah Walmart shootout, we aren't tactically superior beings capable of handling a tailgater with a gun at our back. For all that some even post about going out to bars, getting into arguments with other patrons who stalk them, then conclude they need a bigger gun.
Be very careful about the finger you point because there are always more pointing back.
A few ads to skip in the link, but bearable.
