I think most ND's occur with Glocks simply because of their safety mechanism. Not saying I don't like Glocks...I own some and many law enforcement agencies use them. Hard to beat the good ole 1911 holstered in Condition 1 (my 1911 carry preference), cocked and locked when it comes to safety. The thumb safety is positioned perfectly when unholstering to easily get on target while disengaging the thumb safe, and then you have the grip safety to boot. Not saying one is better than the other, just a comment from a safety prospective. Made me think about the Ten Commandments of Firearm Safety.
3rd COMMANDMENT:
Never Rely on Your Firearm’s Safety Mechanism to Justify Careless Handling.
If your firearm is equipped with a manual safety mechanism, do not rely on the safety as an excuse for improper or careless handling of the firearm. The safety mechanism is merely a supplement to your proper handling of the firearm. The safety mechanism may be broken or altered. Even if you think you have previously engaged the safety in the “safe” position, it may have been inadvertently disengaged without your knowledge while being carried. Never assume that the safety mechanism is engaged in the “safe” position. Your assumption may be wrong or mistaken. Treat your firearms safety mechanism like you would treat any other mechanical device – as something that could break or fail. Not all safety mechanisms operate in the same manner. Before using any firearm, know and understand precisely how the safety mechanism on that particular firearm operates. Never pull the trigger when the safety mechanism is in the “safe” position, and keep your fingers away from the trigger while loading, unloading, and engaging or disengaging the safety mechanism.