They never taught us that in LAWS 101... there are enough harmful products in use in this day and age; why add more? Seems a waste, really. Banning everything we currently have would reduce rights that already exist, which is arguably a bad thing. However, choosing not to legalise another drug doesn't actively take anything away. Incidentally, there's a reason all theft is illegal: theft is a crime. If it can't be called "theft", then it's not illegal. If you take something, but think it's yours, you're not guilty of theft. The comparison is flawed.