it is a miitary axiom that if you swiftly inflict 50% casulties, it will break up "any attack', but the soldiers are not starving, trying to feed starving kids, etc, as the looters of shtf WILL be doing. The way most people "think" and shoot, it would take them a million rds to hit 15 of 30 guys.
Look, dudes, ANY hit on any of your loved ones is unacceptable, so you can't be going at this the way you "think'. get lots of lead flying around, and someone you care about is going to be hit. The only realistic answer is to avoid trouble,and that means not being detected in the first place. that means never being out and about in daylight, and staying below ground. At least for many months after shtf, while disease, fighting, etc, get rid of nearly everybody.