From what I've seen online, the drop tests have a specific procedure and standards for passing. When Sig's P320 first came out and the problems were being reported, their response was that they passed the tests AS PRESCRIBED. Just because they didn't test for the situation that can (not "does always") cause an ND in no way makes it a conspiracy -- unless there's evidence they knew about the problem before distributing them.
Even after the problem came to light, they didn't do a recall because the criteria for that were not met. They did, however, offer to install a new trigger and other parts free of charge for anyone wishing a "voluntary upgrade".
Guns are machines. Some new designs, if not all, have initial bugs that need to be worked out. They can't test for every single variation of every possible situation that might cause a problem. They rely on industry and government standards for those tests.
No conspiracy. Just an exceptionally nice firearm from a reputable company. It's not perfect, but give it time.
My P226 is still my #1 full size pistol. I sold my P320 to my Son in Law, even though it was neck-and-neck with the P226 in terms of ergonomics and shootability.
I had the voluntary upgrade done. If there were other concerns regarding safety, I would not have sold it to him. He tried all my guns at the range and also liked the P320 and P226 best for 9mm. He loved my Sig 1911, too. He bought both the P320 and Nightmare 1911.
I think Glock has relegated their firearms to all be different calibers and sizes of the exact same design. They don't think outside the "Glocks." It's understandable that they have a design that's lasted this long, but if you aren't a Glock fan, it's tough to find a Glock model that "fits" you. Like I said, they are all cut from the same pattern.
Sig, on the other hand, comes out with new designs quite often. They are always looking to improve.
Even Glocks have the occasional ND or accident. As I said, nobody can test for all potential situations. In fact, having to pul the trigger before removing the slide is one of Glock's most unsafe design flaws. The Sigs I've owned have no such "feature." If you don't properly clear the chamber, you're 99% certain to have an ND when taking the Glock down for cleaning. Just saying ...