Maybe you believe Elon when he says that it's worth it, but there's no arguing that it's a steep price to pay.
It's incredibly frustrating that no one has figured out a way to bring about the kind of transformative change that Tesla is after without such back breaking sacrifice. But I think the fact remains there's too much non-linearity in the means of production to get where Elon is trying to go without pushing his people to the limit.
The only "answer" I can give is just that I hope TSLA employees are getting enough equity to make it all worth it.