I think the "probably a junkie thing" is a post rationalisation. People don't want to get involved, and they're putting themselves in a situation they're not familiar with. They just don't knwo what to do so they take the easiest option, and work out a rationalisation they can live with.

One of the reasons I posted. They do know what to do and were taught when they were about five. See if they're okay, and if not, call an ambulance.