Risky ≠ evil though. Yeah, some are easier to OD, and some are more addictive. People should be educated on the effects and dangers before using them. However, "hard drug" is used not as a term for danger, but a term for morality.

As for the gun thing, it's not really the same. The thing with guns is it posses a danger to others. Drugs (usually) only pose a danger to yourself. We evolved to use drugs. Using them in the proper way in the proper context should not be stigmatized or illegal. Obviously using them in a way that does put others at risk should be though, and heavily.