Because they have a set of specialized skills with only a few potential buyers, and if they kill this one, they’ll have very limited options that use their skills without massively uprooting their lives.
The workers aren't the ones killing the company.
If you reread what I was replying to, I was saying they might want to demand changes to management because it’s in their best interest to demand those changes, focusing only on short term benefit to themselves is harmful to their long term best interest. And organized labor does have the power to severely damage the companies they’re part of it’s not all one group or the other.
That's up to the bosses to figure out. If your business can't find employees to do the work at the compensation rate you're offering, then your business has failed. It may even be that your line of business is unviable in the current economy. That's not the employees' fault, that's just business.
This is obviously true but one of the biggest privileges of management is being able to deny this specific bit of reality