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.