No. He can't. Literally.
In a competitive ecosystem, one needs to play to maximize profit sufficiently optimally to remain in business. Otherwise, the business dies, and another one succeeds.
His hands are tied.
If I am in a business making toxic food, and the whole industry is plagued by scandal, as much as:
- I might not want to make toxic food
- The whole industry might benefit from less scandal
- The world as a whole might be a better place
The invisible hand of the free market might force me to keep doing so. Otherwise, I go in the red, and go out-of-business. And if I go out-of-business, someone similar but even less ethical will take my place.
That's why business leaders often do horrific things, while calling for regulation to stop them.
Free markets optimize. Regulations set the constraints of that optimization.