Back when LEO's carried revolvers, they were not distinctly disadvantaged *because the bad guys they faced most likely had revolvers too*. Both sides had to "make their 6 shots count".

Today, most bad guys will have Glock 17s or a Long gun with 30 rounds of 5.56. When choosing my own pistol to carry, I do not want to start out by being disadvantaged by having 5-8 rounds in the gun when the bad guys will have 18-30 rounds in their guns.

There are many documented accounts of LEO's (and even armed citizens), who when the balloon when up, had to fire 10,12, or even dozens of rounds before the fight was over. Why semi-automatics are used in law enforcement

Statistically, we won't have to fire that many rounds. But as long as I'm carrying a pistol to begin with, why carry a heavy one that holds 6, when I can carry one that weighs the same and holds more than twice the cartridges.