Of course there are bad governments. They deserve to be overthrown. Similarly, bad unions should be overthrown. But just like good governments, good unions are possible.

Many countries have healthy unions. The problem in the US is not the concept of unions, it's the American concept of unions. It's how the US goes about dealing with unions. That's the thing that needs to change. Claiming that all unions are bad when that is clearly not the case, is a nonsense argument.