From the pure laissez-faire capitalistic approach, any unioin that brings wages above "equilibrium" is out of balance.Then the corporation must seek either a more equitable deal from the union or move the work to places where the labor is cheaper.
There's part of the problem: as long as there is cheaper labor somewhere, greed will seek it out or create it, or demand it. What we are seeing now is greed manipulating class warfare in order to create cheaper labor. That is why we must draw a line in the sand now. This is just the beginning.
Why should the fellow citizens we count on to educate our children, nurse our sick, care for our elderly, and keep our streets safe have to take a vow of poverty? Because that's where this is headed - the greedy will not be happy as long as there are a few dollars left to grab. This is just the beginning.