Why so many non-matching mags?

[lugerholsterrepair]

The last thing I'd want is an "enemy combatant" fiddling around with a loaded pistol just a few feet away from me.

Norm..A different day and age..If you study the history of WW2 ...by the time hundreds of thousands of German Soldiers were surrendering they had but one intention..to get home to their families and what might be left of Germany. They had known for months if not longer the war was a lost cause. Most if not all were delighted to be able to surrender to Allied/US forces.
These Soldiers were fiddling around with their sidearms for many years as seasoned combat veterans. I would have to bet they knew what they were doing and held no animosity towards Allied Soldiers.