The rules are there are no rules. They're making it all up as they go.
But that brings us back to the point that, since they are just making it all up, it is better to over-punish now and lose later in court than it is to pull another Ray Rice maneuver. There is no national outrage at Roger Goodell and the league office when they over-punish beyond their scope.
No, the rule was....no suspension for first offense. The rule was changed to six games, but that was after this incident.
The league ruled 10 games because they pretended this was four separate incidents, which is absurd.
An appeal would likely reduce it to no suspension, and I think the league may be negotiating with Hardy to avoid an appeal altogether. I wouldn't even be surprised if money was changing hands for the two games missed.
And while Goodell avoids criticism of his stance on DV, he loses more respect in his ability to administer the rules in his league. This plays into the contempt case he's facing.