I guess you don't get it, being it is far from a pin on a fire extinguisher... if it was, the revolvers would resemble a grenade with a pin to pull, not having a half dozen additional parts that work by inserting a key.

Good, keep your locked guns. I don't care. I will not buy another S&W revolver that has a lock. Unless they do a no-lock run of 625s, I'll either buy a used one or opt for something else from another company (I don't see a good .45 ACP revolver, so I might just go with another autoloader).