Historical revisionism comes naturally to the left. They don't mind lying if it serves their cause.
So what? We had slavery in the past too, or to use Ansel12's teminology, Western Civilization was "slavery-based".
Conservatism means making changes to society judiciously and only for good reason. It doesn't mean never making changes at all, or we'd all be human-sacrificing Druids.
We now have the experience of seventy years of drug prohibition to draw upon, and in my opinion it has been an abysmal failure, with an immense cost in money and human lives, and essentially no success in improving our health and happiness.
The only people the War on Drugs has helped are drug dealers and the police and prison guards' unions.