This is a very good discussion point actually and I would like MANY to weigh in with their views.
1) I don't believe we will see the dreaded Space Zombies in my lifetime, so I am saddened about that - but content.
2) That doesn't stop us from throwing a few extra cans of this, or that, in the cart at the store and putting it on the shelves in the garage. Hey, you never know - Right?
I am with Ineff, conscience, for me, is going to be my guide. I am a generous person, by fault, but I have no problem taking care of me and mine first. There is no shortage of people in my little community, and a lot of them have jacked up trucks, and NRA stickers and other things that would lead me to believe that I will not be "alone" in the preparation department.
Then I have a few "other" houses in the neighborhood that will probably be first on the Zombie Buffet plan as they are Left leaning, Prius ( or other offensive vehicle ) owners and frequently can be heard at the community meetings complaining about noise from parties or other such non-sense.
In a Katrina type, short term situation, I feel that you would probably need to be able to take care of yours for a week. 7 days. That is what we plan for in a short term situation, with water and processed foods and things of that nature.
We have started growing some of our own veggies and "we" have taken a more active interest in survival type shows that show how to deal with life when necessities become scarce. I say "we" because I used to watch them and my woman would space out, get on line or leave the room. Then Katrina hit and suddenly she became the second coming of Sarah Connor.
I have a natural gas powered generator hard wired in at our place, so even if we have a ( flood/windstorm/tornado/Mt. Ranier blows it's cork ) and the power lines come down, the gas is always on unless the Earth splits open and the Main needs to be shut down. That means my house will immediately be more secure, but also attract more attention.
Luckily for me, most of my neighbors know that I work part time in a gun shop, that I enjoy my 2A Rights and that I carry quite a bit of the time. Try picking up your garbage cans from the curb one day after work with your shoulder rig on and see how quickly word gets around... LOL
I think you can get too wrapped up in your planning, so moderation is always the key. Don't go into debt preparing for Space Zombies when there are no reports coming out of NASA, you know what I mean? You don't need 10,000 rounds of AR ammo and a $3500 stick to sling lead just because someone on a forum is saying they have that set up.
Truth be told, 100 rounds of AR ammo and 50 rounds of pistol ammo, per person/weapon in the house, is a HELL of a lot of firepower. Especially if the situation is a Natural Disaster and the rest of the country isn't affected.
Now, in the event of total social-economic breakdown caused by the brains in Washington - well, that would be a whole 'nother story.
Do I think that WILL happen? No, probably not. Does that mean I am not headging my bets, just in case....
Well, I would defer to your own best judgement in that question....