You’ve heard about the grandparent scam, where fraudsters call and say your grandchild has been in an accident and needs money or has been arrested and needs bail money. I doubt you’ve heard whether the criminals are ever caught and punished.

People naturally open their doors when someone on the other side knocks or rings the bell. We naturally trust people. It’s built into our DNA until someone compromises that trust, but until they do, we open the door.

If you know of person living alone, ask questions about any possible “love connections.” Winter and holidays are when many single people...