If he has the same offense as Avi and Newman there is no reason to go to this degree of punishment (especially if he is truly sorry).
We can debate the length of the suspension, but it is not accurate to say it is the same offense as Avi and Paul. For Bruce it was a second offense, as opposed to it being a first offense for the others. Yes, the punishment seems a bit harsh to me, but I imagine after the first violation that Bruce was told what the punishment would be for a repeat offense.
Having said that, I guarantee that if one of Tom Izzo's regulars committed the same offense, they would not have sat out.