The grip screw holes in the frame can strip also, which is why the Army insisted that Browning put grip screw bushings in the 1911. The thread strain is shifted to the replaceable bushing so the frame is not ruined by messing up one grip screw.
While the Star type safety used on the Ballester Molina and Ballester Rigaud pistols does block the hammer, it does not block the sear and, consequently, it is possbile for a lackadaisical person (they do exist) to pull the trigger when disengaging the safety, resulting in an AD as the hammer will fall and strike the firing pin.