We've always considered our athletes as above cheating, which is why our own punishments were so severe. Other nations have been happy to let the ICC handle these issues and I believe they will continue to do so (though I could see NZ smacking their boys around too if it happened). The ICC fined/suspended our players much the same as they have done to others in the past so they stayed consistent with their dealing of ball tampering.
This is sending a message to our own players and future players telling them not to be dumb shits by trying to cheat.
As an aside I think if the players were to appeal the sanctions they'll have them reduced, given that no ball tampering incident in the past, both locally and abroad, has had anything near this sort of punishment, irrespective of the way the events played out.