I already answered this before posting the link to here.

What do you think everyone else would be doing while you're raiding the stores? How in a city gone wild do you expect to be able to transport anything without it being attacked? If it's a free for all theres only one you can rely on that's yourself.I have no problem in the wild as I can forrage and hunt and will survive happily away from the carnage of the populated areas.
How many "friends" do you have who would survive long enough to form a group? How many of them could you trust if it came down to the raw edge?
Only someone not confident in themselves would require the "safety" (?????) of a group .