Santa was just having trouble dealing with his wife. The woman force feeds him for her own twisted desires. So he vents on malformed infant reindeer.
Hmm. Yes I can see that. "No one likes a skinny Santa!" she sneers as she piles transfats in front of him. He then spreads that inner dissatisfaction he feels onto any other creature who is vulnerable to attack. There is more than one victim before the movie ends, however, as he instructs his elf to throw a misfit bird who can't fly plunging to his death over the edge of the sleigh, thousands of feet in the air,
without a parachute.
Accident? I think not.
Anyway,Yukon Cornelius was The Man. Manly and grizzly, like a big teddy bear or a misplaced Texan, and as tolerant and accepting as the best of 'em, he and his pups rocked.