Perhaps another good question would be:
" HOW FAST can you deploy your home defense weapon "
If an assailant is whittlin his way through your front door with a buck knife, you have all the time in the world to watch the news, finish your dinner, go unlock the safe, get your gun, remove the trigger lock, open up a fresh box of shells, load the firearm, walk back to the front door, and send a couple of rounds through the door.
I've never had an intruder in my home, but as I understand, it does not happen this way.