The law of unintended consequences is an adage that says intervention in a complex system invariably creates unanticipated and often undesirable outcomes. It is commonly used as a warning against the belief that humans can fully control the world around them.
Saad Shalash / Reuters
A new kind of death squad is roaming the streets of Baghdad, killers packing hunting rifles and poisoned meat. Their prey: the estimated 1 million stray dogs that multiplied in the Iraqi capital as violence paralyzed public services following the 2003 U.S.-led invasion that toppled Saddam Hussein.