I'm against prohibition. The 18th Amendment didn't stop anyone from drinking, but alcohol Prohibition did stop people from drinking safely, enriched the mob, and vastly enlarged Washington in ways we're still dealing with long after the 18th was repealed. Similarly, the Drug War hasn't stopped anyone from getting high, has sent a lot of nonviolent offenders into prison where they learn violence, has enriched the Cartels, corrupted our police and courts, and turned the Bill of Rights on it ear.
Let's give some small credit where it's due: Drug and alcohol abuse does create myriad social ills, so you can at least credit the prohibitionists with good intentions. They might not be very bright, given their refusal to acknowledge decades worth of failure, and they might not be staunch defenders of liberty or the Constitution -- but at least they mean well.
But people who ban straws? Useless busybodies and social irritants.