I think private sector unions have a role to play. And as has been seen in the past if a private sector union asks for too much companies can go bankrupt so both the unions and the companies have some incentive to be reasonable.
The problem in the public sector is that the bill is just passed onto the taxpayer. So the union can just ask and ask and withhold services and the government is forced to capitulate. There is no consequence for a public union. Also the public union currently has no grievance but keep wanting more. There total compensation package is superior compared to a private job, job security is better and they still strike because they can get more.
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