Corruption is equal opportunity. Police unions are known to keep bad cops around. Teacher unions are known for making it hard to fire bad teachers. I agree there are bad union implementations, but these seem like implementation problems rather than core idea problems.
In the list, just about every bad union behavior corresponds to an equally bad or worse corporate behavior. Bad behavior correlates with unchecked power.
The nature of workers and management is adversarial. Working for a company is trading your stress/time for money. The company tells you it's bad to share your wage because that creates upwards pressure on wages, while they go behind your back to ADP and buy your wage history[1] so they can pay you less than you're worth/what they budgeted to create downward pressure. That sure seems adversarial to me.
I do agree that international non competitiveness is a worry, but that's also an argument in favor of letting big un-regulatable monopolies run wild (the counter argument being that monopolies kill/acquire innovation). I suspect parents who work at sweat shops tend to raise more poorly educated mentally worse off children, which then hurts the next generation of engineers/innovaters and society as a whole.
I think I would be most worried about agents (corporate or nation state) agitating small disagreements into big ones or directly compromising and harming industry via agents emplaced in union leadership.
[1]https://news.ycombinator.com/item?id=29834753