I'm sure that at your job where your required to carry, you also have a radio to call for backup. Out in the real world for the rest of us(I used to be an LEO) there is no calling for backup. If you feel fine carrying a gun with no extra ammo i.e. spare magazine, speedloader, or speed strip, well I'm happy for ya, an hope "Murphy" doesn't showup. I believe in the rule of "One is none, and two is One". I might suggest you do some reading by the likes of Jim Cirillo, Jeff Cooper, Skeeter Skelton, and others who have been there. You might change your opinion of how much is enough.
What he said.
God bless Jim Cirillo.