Here's a very sad story. A man and his oldest daughter used the GPS locator feature on the wife's phone to track her down and discover she was cheating. He then killed all his kids.
The man shot four of his kids in their beds, killed a fifth in the bathroom after a struggle, and then turned the gun on himself.
The moral of this story, if there even is a moral to sift out from this tragic mess, is that even though you can do something with technology, that doesn't mean you should.