To push the metaphor a bit further isn't humanity itself a kind of cancer of the earth?
IF the purpose of the company.
Not the purpose of all companies. Humanity doesn't have purpose other than what we make of it. We can strive to maximize enjoyment while keeping population flat if we wanted to.
Edit: The title was changed, it was something like: If a company's sole purpose is to grow, then it is no different from a cancer.