Thing is that you can't blame the keyboard for a PEBCAK. We all encounter that "never forget" moments at some point. Having a Command key is a moot point as the whole purpose of power user tools is this: having the power, and the consequences, at the finger tips. You know: "power is nothing without control", "with great power comes great responsibility", etc - stuff like this.

Don't get me wrong, I am not against specific boundaries for keeping people from doing potentially unwanted actions. But at some point, all the technical solutions to human errors are like sudo.