The safety could be seen as superfluous on a 1911 too. With the grip safety and other safeties it has. The M&P is NOT a double action only. In fact the trigger pull, minus a very light take up, it is barely longer than that of the 1911. The trigger safety and the take up does give a measure of safety over a pure SAO so I don't feel a safety is necessary on the M&P but I'm picky about what holster I would carry it in too. I think a kydex or well formed stiff holster is a must without a manual safety.