You should report worrisome behavior to the authorities.
Stephen has been noticing a suspicious car repeatedly driving by his neighbor's home for the past week.
Stephen wants to stay within his boundaries.
Stephen reports the suspicious activity to his neighbor, who reported it to police right away.
Trying not to interfere, Stephen never mentions the suspicious activity to anyone.
The police presence in the neighborhood deterred the suspicious car from ever returning to the neighborhood.
Stephen's neighbor is robbed by the person who had been staking out his home.