Bill Gates funds the world's largest mosquito factory

Bill Gates―a man who believes the world to be massively overpopulated―funds the world's largest mosquito factory, which breeds 30 million bacteria-infused mosquitos per week, then unleashes them on to the unsuspecting public, "to save and improve millions of lives".

Why would a man who believes the world to be massively overpopulated―a belief he has publicly stated on numerous occasions―want to "save millions of lives"?

Source:
@MJ_Innocent