Because it just causes endless, idiotic little niggling questions from people like me and you. But once you've invented something like this, if you take it away, people get upset.
Sandstorm's faith in Cloudpaw pleased him more than he could say, but he couldn't get rid of the niggling doubt that his nephew would ever truly understand the warrior code.
Ever since Madeline had first mentioned Saxon's name on the night of the book club, there had been something niggling at Celeste, a memory from before the children were born, before Perry hit her for the first time.