Absolutely! The trick is how to differentiate between Norman Bates and Chuck Noland.

The OP has set up the situation after "a disaster hits", and that could alter the situation from an everyday car breakdown or getting lost. There are some people who will do the right thing no matter what the situation (like everyone here at ETS ), and there are others who may feel that overwhelmed or non-existent law enforcement gives them the opportunity to act in a way they've often wished they could, with no personal repercussions.

If you could watch the person for while (unseen), it might give clues to his personality. For instance, if I saw a man who lashed out when his fish fell off the stick into the coals, kicking and screaming, I'd pass on making myself known to him. If he failed at doing something, but patiently kept trying, that might indicate a more stable personality.

But like so many other things, luck (good and bad) always plays a part. If you desperately need help, you simply have fewer choices, and there's really no getting around that.

Sue