DDT is very effective at killing the mosquitoes that carry malaria. Malaria kills 2 to 3 million people a year. These people, the bulk of whom are children and the elderly, live in the global South, the tropics of the developing world.
DDT doesn't just hurt mosquitoes. The United States and most Northern countries have banned its usage because of its threat to animal and human health. These bans are extended to the foreign assistance that flows North to South.
Is the ban the "best" thing for those facing the imminent threat of malaria in developing countries?