movie oddities that make no sense

In this classic 80s film which made Karate a major trend among youngsters we hear again and again how kicking your opponent in the face is illegal and won t be tolerated by the tournament s officials. However, Daniel san beats Jonny in the final with the legendary crane kick to the face, becomes a champion, and gets the girl too. So what? Just a minor little detail as long as it s the good guy doing the face smashing, right?