I think Johnny was just your run of the mill insecure bully who did it all to make others like him. You could feel his guilt right after he swept the leg. A true villian probably would have smiled at Daniel's pain right there, but I think Johnny was legitmately concerned about Danny's well-being. If you took out the last 10 minutes of that movie you'd have 1 hell of a villian, but his moments of weakness make me unsure.

The true villian of this movie was Kreese. All around badass. Not even a hint of weakness...ever.

***You're the best, around...nothin's ever gonna keep you down.......***