" Unfortunately, there’s a downside to the dopamine system, and that is addiction. Addictive drugs take over the role of reward signals that feed into the dopamine neurons. Gambling, pornography, and drugs such as cocaine cause the brain to flood itself with dopamine in response. So, too, do addictive ideas, most notably addictive bad ideas, such as those propagated by cults that lead to mass suicides (think Jonestown and Heaven’s Gate), or those propagated by religions that lead to suicide bombing (think 9/11 and 7/7). "

― Michael Shermer , The Believing Brain: From Ghosts and Gods to Politics and Conspiracies How We Construct Beliefs and Reinforce Them as Truths