Is it that you realize your views are unethical and inhumane as they're predicated on the creation and maintenance of human suffering for the benefit of others? Or just that you can't think of a counterargument and are unwilling to admit that you're maybe wrong about a thing?
There is no "natural balance". You're also ignoring (or perhaps, deliberately avoiding) that said "balance" is fundamentally
unbalanced by the existence of duress on only one side of the equation, that of the workers.
If we told people to sign a contract or their children will go without food and they'll end up homeless in the street, that would be considered an unlawful threat and that kind of duress would render such a contract null and void, legally speaking. But that duress is present in
every labor negotiation, and gets to skate by as it's only
indirectly present; the potential employer is not
personally responsible for the state of duress, they're simply
exploiting it for their own gain, at the expense of workers.
None of this is "sustainable". It only ever lasts until the workers get fed up with being bled for the rich, and then the workers do things like invent the guillotine because they're slaughtering the rich in such numbers they need a more time-effective and reliable means to use for the process. The boom-and-bust cycle of capitalist economies is similarly not "sustainable"; it's constantly veering away from boom cycles into recessions, and only barely pulling itself out, and generally only doing so through exactly the kind of interference that you're bemoaning.
We
tried a capitalist system with no fingers on the scale. The 19th and through the early 20th Century Industrial Revolution. The outcome was egregious income inequality, people working 16-18 hour days 6-7 days a week just to make so little money that their children would have to work by age 6-8 if they wanted to eat. It was an economy that flipped from boom to bust so badly it
ruined economies; the Great Depression was the final straw that forced governments to respond, but the Great Depression has that adjective "Great" for a reason; it was
not by any means the
first Depression, just the latest in a long string.
Feel free to browse the list if you doubt me;
https://en.wikipedia.org/wiki/List_o..._United_States
The idea that a free and unchecked capitalist economy would be
sustainable is an absolutely ridiculous idea that has been conclusively and repeatedly debunked by reality.