Government employees should not be in collective bargaining units. Period.

In private sector, everybody's in it to make money and unions balance out management's inherent leverage.

In public sector, the mission is public service. You'll be taken care of in the civil service, no doubt about that but unions should not be extorting largesse from the public coffers. You want to make it big (and take the associated risks) that's what private sector is for. Probably no coincidence that the one government entity which is actually held in high regard and is considered pretty effective has no unions...