Hmmmm...that's surely one aspect. But it's very black and white.
But it's really hard for parents, because there is (in many countries) such a culture of santa and the easter bunny etc.
If I think about it, I am still pissed off about OTHER lies my father told me, but not the fairies and easter bunnies and such.
I think I recognized them as a fun thing for kids, quietly and naturally worked out that they were a tale, and equally quietly pretended still to believe in them, because I knew I would get extra stuff that way!
I don't think I'd be able to lie if seriously challenged about them, though.
I remember my little cousin sending my lovely Auntie Merle into a terrible moral torture chamber. He was about 3 or 4....and he marched up to her one christmas, fixed her with a basilisk glare...and said :" I'm going to ask you something, and you have to promise to tell the truth!"
She promised, and, of course, he asked her "Is father christmas real?"
She was paralysed like a deer in the headlights, and the entire family shared her agony.
Then she told the truth.....only to be met with a towering rage; "You should have lied!!!!" he wailed.
My Gethsemane came with a munchkin with a morbid fear of ghosts.
We examined the evidence pro and con.
"So...they don't exist." he said.
"But what about father christmas and the easter bunny?"