I didn't see anybody here indicating confusion over the improperly designed Beretta decock/safety. Just that it is ergonomically a mess, requiring either two hands to operate, or shifting the strong hand to manipulate. I strongly suspect if it was Taurus instead of Beretta that made that mistake, the caterwauling could be heard from outer space over what dummies the designers at Taurus must be.
I would say that "improperly designed" is strictly a matter of opinion, when the Beretta 92FS is on safe, the firing pin plunger is turned down and points away from the firing pin, exactly how it was designed. It is one of the most "drop safe" pistols ever manufactured, an important feature on what is usually considered a service pistol.