Right, but that doesn't address the issues that all 320's have. In that case, the airman lied, but the guns still have those issues.
Maybe the issue is that the 320 is too close to a competition trigger, and it isn't appropriate for a duty gun. But the gun has been under a microscope for years now, and no one has shown a design defect that causes the gun to fire by itself.
If the gun was able to fire by itself, without the trigger being actuated, then someone should make it happen on video. Shake the crap out of it, bang on it. Take it in and out of a clear plastic holster 1000 times until the supposed defect happens.
Here, the police officer isn't even touching his holster.
Regardless, if there is a defect in that particular gun, they should just demonstrate it. If it isn't the holster, or something in the holster pulling the trigger, make it happen outside the holster.
A hair trigger is unsuitable for combat use because of the "errybody be muzzle sweeping errybody up in here" nature of combat.
Those two uses are 99.99% of what the air force needs its pistols to do.
They could give it better tolerances so it has a "good trigger" without "hair trigger" but that will cost a lot of money. Or they could give it an absurd trigger pull like duty guns had in the "good old days" but that will cost just as much money for equivalent results because you'll need to train the force more to get the same accuracy of fire.
Additionally, with the fairly sloppy nature of these guns and the fundamental nature of how handguns work, it's not unforeseeable that they do get clapped out to the point of just going off if you bump the slide right as they age since they're so close to that as is.
Considering how many people need to be trained/equipped and how often the air force fires sidearms in "real" situations both of these solutions are way, way, way more expensive than a few bodies.
2: The trigger is what it is, the military and police departments chose it for what was.
I agree, the police in particular, should use a gun that takes more effort to fire. But don't blame Sig for this, it isn't a design flaw.
There are also manufacturing issues with intermingling parts with different geometries intended for different calibers and building guns with the wrong parts, such as installing a 10mm Auto/.45 ACP takedown safety level in a 9mm gun, or installing a metal injection molded firing pin safety that's out of spec, worn, or contributes to tolerance stacking in such a way that the gun becomes unsafe.
For example, Sig offered a "voluntary upgrade" to fix the well documented drop safety flaw with the P320, and there's video proof of the same guns going off still in holsters.
Sig is going to be playing whackamole fixing these issues if they ever admit to it, so they won't.
As you point out, the drop issue was well documented, and then fixed. So far, no one has identified a cause for the possible uncommanded discharge.
A gun in a holster can fire when it is moved and the holster is poorly fit, incorrectly configured, or there anything caught in it like tail of a shirt, drawstring. Also, many police have a flashlight on their pistol, which opens up space quite a bit making it easier for things to get caught inside.
The range video where they are standing on the line was allegedly a modified gun with non-Sig upper and trigger.
Officer standing and moves slightly and it goes off, with their hands in front of them? (Eyewitness)
And at least 3 others. There are some good compilation videos out there.
The argument is that there exists a combination of states and tolerances when a P320 is loaded and cocked that could, theoretically, allow the striker to impact the primer forcefully without a complete and full trigger pull, one where you don't feel the break. This could either be while the finger is on the trigger (maybe a police officer pointing it at someone who has a weapon while commanding them to drop the weapon, for example) or not (in a holster).
Inserting that screw is meant to simulate a tolerance stacking issue wherein the pistol's components don't line up together in such a way as to prevent the striker from slipping past the sear.
Is it wonky? Of course. Could you probably do it with other pistols? Probably. Are there police officers and servicemen/women who need a convenient excuse for their negligent discharges? Yes. Should a real investigation occur? Also yes.