Anyone know why Karate tradtionally doesnt allow punches to the head?

Eh... Traditional Karate, including all modern Karate organisations allow punches the face. Kyokushin branches are the only one that don't.. Even they hold some tournaments with face punching and gloves.

 

So if traditional Karate does not allow punches to the face, then canadians don't play hockey and Russians never wrestle.123