Ponder, I'd suggest that recommending someone who doesn't already have and know how to use a gun safely, get one for emergencies, would be dangerous and do more harm than good.

Guns are more than gear. They require special training and a specific mindset. I'm not against them, but some of us aren't that far over in the preparedness spectrum that firearms are viewed as a neccessity. Just like the bible example, having guns, whether for hunting or protection, is a person choice, but unlike a bible, using a gun should never be a last minute decision.

EDIT: These lists are made for people who are just getting started in preparedness. They need to be told to store extra water and batteries, and many are hesitant to do even that. Imagine their reaction if the list said "get a gun and learn how to use it." Now imagine the nightmare if some idiot actually did get one and tried to shoot for the first time ever while under the stress of a disaster.