You're delusional with your sharia law. We're not living in Afghanistan.
Suggest you read up about Sharia law and/or Afghani jurisprudence. Under such institutions, males are
very rarely subject to any punishment for spousal abuse, even if the woman involved can prove it was happening and somehow manages to get the local law enforcement to listen to her. Then she's usually got to get a male to represent her in any legal proceedings that occur, and/or find males to testify on her behalf, because it is frequently the case in such regimes that a woman's testimony is inadmissable as evidence.
You said yourself in a previous post that rugby league has programs to educate players on attitudes towards women, yet these things keep happening. Why? becuase these players have already learnt their behaviour as children! who is responsible for this learnt behaviour? Parents!
Behaviour can be changed. It requires a willingness to do so, but it can be done. I'm not going to play Misery Roulette here, but I didn't have the greatest childhood; I was subjected to violence on a very regular basis, and I have the scars and cracked bones to prove it. However, you don't see me flipping out at the checkout because the cashier stiffed me five cents in change, going on a murderous rampage through the aisles.
For another example, consider Germany. A whole generation of kids grew up in World War II. What is Germany known for these days? How strongly they abhor that part of their history, and their aversion to violence (to the point that many foreign movies with lots of gun battles and explosions have to be cut down-
GI Joe's German version consists of three lines and runs for five seconds

).
The problem with high-profile spousal abuse cases is the message it sends to others who may be tempted to arc up. In many ways there is a necessity for the courts to go hard on such offenders, because if they go soft lower-profile offenders will argue their punishment should be lighter as well, which has the undesirable knock-on effect of making as-yet undiscovered abusers more likely to think that even if they do get caught they won't be facing much of a penalty.
To this end, a strong stance from the ARL/NRL is very useful. If a player is punished- and in cases like this I would apply a lifetime ban in addition to whatever the legal system dishes up- it sends a message to all the other NRL players to toe the line, and to society at large that such behaviour is unacceptable.