Every unfortunate incident, in and of itself, is one in a country of 281,000,000. Willful myopia is not the stuff of reason.
Years ago we thought of police and athletes as heroes. That is pretty much gone. Some are...some aren't. Our expectations have been lowered considerably. Be that as it may, I think we can reasonably expect armed law enforcement officers to be proficient with their weapons. I dont think that is unreasonable.
It appears that this shooting was a negligent discharge based on insufficient training in SAFE weapons handling.