I don't see it as the end of the world, but anything that forces the use of an inherently dangerous action (e.g. pulling the trigger is generally intended to launch a bit of lead) creates room for error.
Imagine if the only way to service the engine on a car were to be sticking your finger in the engine while someone else turns the key...oh, and make sure the battery is disconnected before doing it. It's a stretch of an analogy, but the general primary function of turning the key is to make parts move.
And I don't believe you can chalk everything down to stupidity. People are fallible, and throw in exhaustion, a long day on duty, a wife yelling at you to get your ass home, a requirement to clean your pistol before leaving the range, people talking to you, people yelling at you, and on and on, it becomes difficult to keep track of everything.
For such a user-friendly design, it WAS an interesting design choice, and I hope everyone here remembers to double check that chamber!