If you ask me,
The only time I would use blanks for self defense is if I were shooting grenades at them with my Yugo SKS. Our house rule was, is, and always will be, that you don't draw unless you are prepared to stop a threat using all possible force, which may or may not result in the death of another human being and that if you don't feel you could do that, you shouldn't use a gun for home defense.
Gun Control-gun con·trol n. definition 1. The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker received that fatal bullet wound. 2. The ability to hit what you are aiming at.