The leadership of a union represents it's members in about the same way a government represents it's citizens - that's to say on paper, but really they're in it for themselves.
I'm a developer, my wife's a teacher. She was recently laid off, and got nothing whatsoever. How helpful were the union? They did nothing. After years of being forced to pay dues to a union she didn't even want to be a member of they were completely useless the first time she had a problem they're supposed to be there to help with.
On the other hand, I know my employer has laid people off in the last few years and they always get nice severance packages including cash, training and job seeking assistance. I earn FAR more than her, my hours are more flexible, my management is far better, and my working environment is better.
So with the unions preventing employers from firing useless people (and instead making sure it's always the person at the bottom of the totem pole who gets it - way to encourage new talent!) and actively working to prevent keen & passionate employees from going above & beyond (wouldn't want to make anyone else look bad!), and then providing no benefit whatsoever when the shit hits the fan - I'm happy to be as far away as possible.