I tend to agree with
federali's comments and thoughts.
Reviewing such information probably requires some situational context in order to be useful for many folks. Sheer statistics can be bewildering and may not be applied in the most relevant and effective manner by someone.
I've known a number of folks who have been involved in on-duty & off-duty shootings, and as an instructor I've had an opportunity to learn of many more.
Sometimes as few as 1 or 2 rounds have been fired and successfully resolved the situation, sometimes more. Situational context and specific circumstances vary.
When I retired I was carrying an issued compact .45 that carried 7+1 rounds. Prior to that I was carrying various other issued pistols (9mm, .40 S&W & .45) that had capacities ranging from 8, 9, 12, 14 & 15 rounds at one time or another. If I wasn't carrying one of the issued weapons off-duty, I was carrying one of my own, which meant I had magazine capacities of 6, 7, 8, 9, 10 or 12 rounds ... or carrying a revolver with 5 or 6 round capacity.
Now that I'm retired I still carry pistols with magazine capacities of 6-12 rounds, with 8-10 rounds being the most common capacity range ... and I carry one of my several 5-shot .38's more often than not.
I
do, however, spend a fair amount of time continuing to maintain my skillset, by keeping my hand in things as a firearms instructor and attending various training related to such issues. Shooting has been considered to be a
perishable skill, so it pays to not only develop and refine it, but to work to maintain it, as well.
I've never denigrated another cop (or CCW licensee) for choosing to carry a handgun with higher capacity than what I choose to carry. Not my choice to make, or my business (generally).
My concern lies in their skillset, mindset, familiarity with their chosen (or required) dedicated defensive weapon, how well it's maintained, their familiarity and ability to safely use a chosen carry method and how well they maintain their understanding of the laws involving the use of deadly force, etc.
Now, this subject is one of those perennial topics which often generates any number of divergent opinions among folks who frequent online firearms forums. No problem. Opinions abound.
Experiences abound, too ... and it's not uncommon to find that the experiences of many folks don't necessarily conform to that of other folks.
I have noticed that there are any number of private persons (non-LE) who choose to go about their daily activities, being lawfully armed, and who choose to carry more ammunition & spare magazines than many cops may carry on-duty. Sometimes even more guns. Their business (presuming it's legal within their jurisdictions, of course).
I just hope they've invested at least as much attention and consideration to their skillset, level of training, sufficiently frequent practice, weapon & carry method maintenance and knowledge of the relevant laws ... as they have to how many magazines and how much ammunition they feel they should carry on their person.
It might also be prudent to remember the responsibility involved for each and every round fired, and the potential for unexpected and undesired consequences to result when/if a round hits someone/something other than the intended target (or even the "intended target" if the circumstances are later determined to be such that it wasn't actually lawful to shoot).
Having a lot of rounds at hand might be helpful, but it might also allow someone to make more mistakes at a faster rate.
Just my thoughts.
Some individual risk assessment, informed decision-making, common sense and prudence can go a long way, at times.