The people are professionals, what if we expected the same percentages out of doctors, engineers (like me), and pilots?
Well....what was the hit rate of either fighter pilots or bomber pilots using iron sights during the past century? I bet more Americans have been killed by errant bombs or bullets coming from an airplane than by errant bullets coming from cops' guns...Give us some smart bullets that work and we'll use them.
As far as doctors vs. cops, I believe that police officers kill far fewer innocent people through negligence than doctors do.
As far as too many bullets, the standard answer in court to a question like "Why did you feel the need to fire 12 rounds" is "Because I felt 13 would have been too many."