The most powerful path available to the public is:
1) Spread the news - tell everyone about this and any other similar instances
2) Boycott Fisher-Price products
Follow up by contacting your Federal representatives to:
1) Demand investigation and accountability of the company
2) Demand investigation and accountability of the gov't agency who is tasked and paid to safeguard the public. Overhaul or disband.
3) Enact stricter penalties on businesses that produce unsafe goods, maybe estop all operations for a length of time in addition to adding oversight.

And please don't equate deaths in lakes and pools to death by using unsafe products, especially when the manufacturer is aware of the defect, as is the agency supposedly monitoring said safety, or lack thereof. They are as different as peaches and limes.