Some argue that allowing your kids to believe in the magic of the holidays isn't a terrible thing. Psychology Today's Dr. Vanessa LoBue wrote:
There is some evidence that rewards (like Christmas gifts) undermine children’s motivation. So maybe relying on Santa or an Elf on the Shelf to promote good behavior isn’t the best strategy if you want your kids to be good all year round. But there is no evidence suggesting that learning the truth about Santa is traumatic for children—or that it leads to trust issues between kids and their parents.
Fast Company wrote that convincing children Santa is real might do more damage later when they find out the truth. Charlie Sorrel wrote:
What effect do these lies have on kids? Richard Dawkins, in his book The God Delusion, argues that such fairly tales “may cause children to lack creativity,” but at the same time the Santa myth gives kids a valuable lesson: Not everything adults tell them is true.