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A .357 Magnum with a 180 grain JHP at 1325 FPS is a horrifying close range weapon. A 10mm pushing a 200 grain JHP at 1200 FPS is fearsome as well. A .357 Sig moving a 147 grain XTP at 1400 FPS isn't a love tap.

All of those rounds are available, common, and effective to at least 50 yards. Against a highly skilled opponent, a sidearm vs a rifle is a crippling disadvantage. Against a burnout who bought a rifle for the sole purpose of committing exactly one crime, it is possible to even the playing field. I carry a .380 ACP because my use case is escaping someone who wants to kill me or a loved one. A peace officer may ve required to be far more aggressive without forewarning, and as such should probably arm him or herself accordingly.