I think the feeling is that Arbitration in this case means compromise - the suspended are either guilty or they are not. Perhaps that compromise is the likely hood of them getting away with the action that brought them to attention in the first place. However mitigating circumsances may be taken into account when considering the penalty. We often hear about those found guilty and sacked, but little about those who have been found not guilty of misdemeanour, or those whose actions did not warrant being fired, i.e. kept on, but an admonishment entered on their record.