Why did Rudy get himself disqualified from the race?

Rudy hated these races organized by the Nazis. They represented everything Rudy hated. He did not want to become a Nazi athlete. This is why he disqualifies himself.

Rudy hated these races organized by the Nazis. They represented everything Rudy hated. He did not want to become a Nazi athlete. This is why he disqualifies himself. So stupid, (and yes...I know its wrong to say it like that but its true.)