Responsibilities of a Director of a Corporation

The responsibility of the directors of a corporation is to provide a return to shareholders on their financial investment in the corporation . . . in other words, shareholders expect to make money on their investment.  Corporations such as Facebook, Google, and Apple are financed through the sale of billions and billions of dollars in shares purchased by investors.  Sometimes, however, the duty to maximize profits runs contrary to legal, but still questionable, business opportunities.
Assume that you’re the director of one of the corporations listed below and have been presented with the business opportunity described in the scenario.  Would you advise the corporation to accept the opportunity?  Make sure to fully explain your answer, considering both the financial return expected and any related ethical concerns.

ToyCo has just been informed that it’s wooden trains produced in China contain lead paint and can no longer be sold in the United States.  However, a distributor offers to negotiate a deal with a foreign company to sell the trains in a South American country that has no laws addressing the presence of lead paint in children’s toys.
BabyHealth is seeing decreasing sales of its powdered infant formula in the United States due to more and more mothers choosing to breastfeed their babies.  In an effort to offset these losses, BabyHealth chooses to sell their formula in third world countries.  However, it is widely known that the water sources in these countries is often contaminated and not boiled prior to use.
After producing 10 million versions of its new smartphone, PhoneLand discovers that due to a manufacturing oversight, 5 of the phones may catch fire if left in a car on a hot day.  While the worst case financial impact from the phones catching fire is 10 million dollars in damages, recalling and repairing the phones will bankrupt the company.