Each "Safety" is to prevent the gun from firing
If a gun is needed it is normally needed immediately under operator stress
Under stress people forget things, things that may make the gun inoperable for its primary function.
Also more parts, more things that can go wrong
If any one of the "safeties" fails to release the operator has a very short iron bar, not a gun.
Note that the German military removed the (Swiss) grip safety.
Trap shooting - I have forgotten to switch the safety off when calling for a clay. I realize as soon as I fire and it doesn't. But clay targets is not critical.
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