Two problems with your view (to me, anyway), and they're both slightly related. One is, if disaster strikes, I want to be in a position to help as many people as possible, which requires me to be self-reliant and "prepared". The other is that most of us have to learn how to prepare, and the best way to do that is to listen and share information with each other (i.e. help each other before disaster strikes, so we can help others after).
To me, a key point of being prepared is so that we can rebuild/maintain society in the event of a catastrophe...having an "everyone's my enemy" perspective is very anti-social, and makes me question your long-term mental preparedness. So I got to ask, what's your reason for trying to survive if you're just going to become everyone's enemy?
For me, being prepared for a big disaster means I'm all that better prepared to handle (and help during) minor disasters, such as an ice storm and no power for a week, significant illness or injury in my family or community (other than "swine flu" or some pandemic), etc.