Ever catch a lie in your favorite childhood movies?

Remember the Loin King. Yeah me too. I was just a kid so I never knew pretty much the whole movie was pretty much  build on a lie. Scar, Samba's uncle had killed Mufasa, Simbas father, the king of pride rock. Scar made it look like a accident, but we all know he murdered him. Simba doesn't know his father was killed by Scar. Simba thinks it was all his fault and Scar proceeds to lie to Simba. So we see something on the screen does it make it okay to lie? Could this be where we have learned that it is okay to lie? Like wise  was it okay for Jay Gatsby to lie about himself though out the novel? He lied to everyone about just how he had gained his his wealth. So is it okay to lie? When will it ever be okay to lie?