Well, yes, that's true. And obvious. But the main point is that nobody can do anything ever.
This offers a lesson for policymakers -- and not just those who focus on drug policy. Often in policymaking there are no backsies; undoing some policy mistake gives you very different outcomes from the ones that you would have gotten if you’d never tried it in the first place. That’s not an argument for never experimenting, but it is an argument for caution. You break it, you own the outcome.Strange that McArdle wasn't as cautious when it was time to invade Iraq or bail out the banks.