In the case of the US, "legally required" is a myth. A common one, but a myth nonetheless.

> To quote the U.S. Supreme Court opinion in the recent Hobby Lobby case: “Modern corporate law does not require for-profit corporations to pursue profit at the expense of everything else, and many do not.”

https://www.nytimes.com/roomfordebate/2015/04/16/what-are-co...