Prove to me that enforcers don't. Prove to me that penalties do. Be careful with this one, you'll find that the reasoning becomes very interchangeable.
After playing hockey for almost 40 years, and 10 of those where fighting was a penalty or GM, I know that who we were playing affected how many guys acted. I bet many an NHLer will tell you the same thing.
There seems to be a confusion that any sort of cheap shot is proof of something. It's not.
The idea that enforcers deter dirty play is a myth. There is absolutely no rationale to the idea. Follow a simple logic exercise.
1. Are there dirty players in the league.
A: Obviously yes.
2. Are there enforcers in the league who are good at fighting?
A: Obviously yes.
3. Can all / most of the dirty players take care of themselves in a fight?
A: No - see Matt Cooke, Brad Marchand, Raffi Torres, Patrik Kaleta, Dan Carcillo, etc..
4. When a dirty player makes a dirty play, is a fight a natural, inevitable consequence?
A: No. The opposing team will undoubtedly want to get at the offending player, but if he is not a big tough player who can handle himself, there are simply too many ways to avoid having to fight.
- If the player is over-matched, a bigger teammate will usually step in.
- If the player is over-matched, the linesmen will quickly intervene to prevent injury.
- He can skate away
- He can turtle
- Or if he's strong enough, he can simply hang on and tie up his opponent until the linesmen step in.
I've been watching hockey games for over 45 years. While it has probably happened, i can't recall in all that time a situation where the linesmen / teammates have allowed a clearly over-matched player to get beaten up on the ice. This is somewhere between extremely rare and a unicorn sighting.
The league simply can't allow a player, even a dirty one, to get beaten badly on TV.
5. So if fighting is not an inevitable outcome of a dirty play, then what does a dirty player have to fear from enforcers?
A: Nothing.
6. So if there is no fear, no consequence, where is the deterrent?
A: Fighting is not a deterrent to dirty play.