Obviously when they don't truck around petrol, things get ugly. I personally think it is great that they make that much. More power to them.
Now my CYA statement. I think Unions are vital. But do they get power hungry? Yes. Do they overstep their bounds? Yes. Do they ask for too much? Yes. But if you replace 'Union' with 'Corporation' you get all the same answers. It isn't perfect but it is better than the alternative.
NOTE: I believe my employment requires me to not support unions, or advocate them, in places where I am doing work. So if you work for a company that I am doing engineering for, I have no opinion on unions.