In short, it doesn't. The fiduciary duty of corporate officers and directors has existed as long as corporations have existed.
The fiduciary duty permits consideration of interests other than the immediate share price/book value/earnings-profit of the corporation.
That little bastard Milton Friedman proposed in 1970 that corporate governance should consider nothing other than profit and return to shareholders. That's never been the law, but it has been a canon of business ethics for a good long while, to our great detriment. This is known as the Friedman Doctrine, or shareholder doctrine, as opposed to the broader "stakeholder doctrine," which explicitly considers the interests of others as part of the broader interests of the corporation.
Also, regarding Wisconsin Aluminum Foundry:
And, in 2019, Sachin Shivaram brings his vision for growth to WAF as the first non-family CEO of the family-owned company.
Likely all Trump voters, wildcat's petit bourgeouisie.