The avengers were wrong. Imagine if Santa was real and just discovered by the world. Now imagine if he made one mistake and dropped a present from the sky that killed a bald child in a wheelchair. The U.S Government who was just inching to assault him for his advance interdimesanol and size changing tech,takes that and yells to the whole "he's too powerful he must be stopped!". They go and imprison Santa but the tech just explodes as a failsafe and nobodies gets anything. No body get anything and the world just became a darker less hopefull place. Oh yeah and Santa is killed by specific antisanta gas by krumpus months later.