I dont. Species go extinct all the time and we're already trying to kill them all with bad side effects like indiscriminate pesticides.

This is one case of me falling on the side of intervention. Malaria is a terrible scourge, primarily on children. So much so that humans evolved sickle cell anemia as a prevention.

http://www.pbs.org/wgbh/evolution/library/01/2/l_012_02.html