Bad Santas depicted in film or on television

Cafe Society
41

In Reindeer Games, a gang of Santas rip off a casino, and most of them end up dead.

42

There’s the episode of The Tick with Multiple Santa. At the end, the replicating Santa fills The City with a wave of false Santa’s – a “Yule Tide”, as The Tick puts it*.

http://thetick.ws/car23.html

There is also a complete run of Evil Murderous Santa movies, of which the afdorementioned Silent Night, Deadly Night is but a single example
Santa’s Slay

Black Christmas (two versions!)

You’d Better Watch Out/Evil Christmas/Christmas Evil

Sint

*This one also has one of the funniest depictions of Santa’s elves – they’re short, dark-glassed and earephone-wearing “Secret Service” types.