I didn't know that there were no laws requiring companies to act in the interest of shareholders, I guess that's a common myth.

It still seems pretty evident that the power structure at larger companies necessitates that people do act in the interest of investors - as doing so is in their own best interest. I'm no expect and I'm sure more educated people could argue both sides of that though. In the end, I think the behavior of companies that exist is at the very least enough to suggest that the organization of companies in capitalism motivates profit above all else - to the point where horrible acts are committed frequently and are expected from larger corporations