I see where you are coming from. The main reason, I think, for drug users being demonized is legality. It is very easy for people to equate lawful with good. If people are doing illegal things, they must be bad, right? Another reason might be scarcity of information. The people who are likely to become addicted are less likely to have access to accurate, unbiased information about specific drugs. The type of information that is provided tends to be along the lines of "drugs are bad, m'kay" without any real information. I think the best way to combat these is to legalize, tax, and regulate all drugs and to provide accurate information on drugs and drug safety. That's likely to be pretty controversial, and I don't think it'll happen any time soon, but It seems to be the only way that promotes safety and protects individual freedom.