[hga]

Your first point reinforces the point of the Small Arms Survey as I recall, that most German guns are not in legal circulation. But the numerous shootings I listed, which you completely ignored, show they all aren't stashed away.

"I don't even know if you can still use a weapon that has just been lying around for seventy years."

If it was cleaned properly before putting it away, and in a moderately dry place, yes. Back then corrosive primers were common, so that was an essential and inescapable part of owning a gun (counter-examples are the round the Swiss adopted in 1911 (!) and the US M1 Carbine, a short rifle for officers and others who weren't front line infantry). For that matter WWII ammo is still generally just fine, modulo your having to much more thoroughly clean your gun afterwords.

ADDED: I have used/owned two military rifles manufactured in WWII, a Springfield 03A3 and a Garand. Basically, I'd consider myself well equipped if I had most any originally military rifle starting with the Mauser 1898. Yes, more than a century old....

And the fact that you haven't deinstitutionalized your mentally ill like we insanely (so to speak) have puts a different complexion on your crime, including "gun crime" statistics and incidents.