The tendency of fictional works to assume that characters can talk to, share a room with, or travel with complete strangers without doing a background check or even a basic spot check - and despite this, nothing bad will ever happen. A Justified Trope, as in ancient Greece, accepting aid from and giving aid to complete strangers was shown to be a virtuous characteristic. Even in relatively recent times and stories it was not improbable for these sorts of events to occur; strife at them is likely to be due to Values Dissonance. When this trope is in play, Walking the Earth may become easier.