Another point:
We just had a story in the local news about an area cop assigned to a school. He was in an office with a faculty member and decided to show him his gun, demonstrate how to clean it...
Guess what?
Yep... the gun "went off" as they say on the news.
Now, do you supporters of mandated training propose MORE training is required than what this cop has had? He obviously wasn't TRAINED enough since he made such a dumb mistake.
Training is just that. Its not always learning. Most LE agencies have a policy against such actions. This person not only was reckless but most probably in violation of policy.
There are numerous examples of people who have been trained having negligent discharges. Training does not idiot proof an idiot.