From the Scientific American essay “Murdercide: Science unravels the myth of suicide bombers“:
Another method [of reducing terrorism], says Princeton University economist Alan B. Krueger, is to increase the civil liberties of the countries that breed terrorist groups. In an analysis of State Department data on terrorism, Krueger discovered that “countries like Saudi Arabia and Bahrain, which have spawned relatively many terrorists, are economically well off yet lacking in civil liberties. Poor countries with a tradition of protecting civil liberties are unlikely to spawn suicide terrorists. Evidently, the freedom to assemble and protest peacefully without interference from the government goes a long way to providing an alternative to terrorism.” Let freedom ring.
This seems obvious to me.