I understand the arguments for the legalization of marijuana: It can generate tax revenue. It can reduce illegal supply and demand. It can strip power from cartels and lessen crime across and at our borders. And it isn't so dangerous as other illegal drugs or alcohol. President Barack Obama even claimed one of those arguments when he recently told New Yorker Editor David Remnick, "As has been well-documented, I smoked pot as a kid, and I view it as a bad habit and a vice, not very different from the cigarettes that I smoked as a young person up through...