Yes there's a failure of information somewhere and people that fall through the cracks should be able to find their way out again, but the root of the problem stems from publicly vilifying people and actions that should be legal. Regulating all drugs like cigarettes, for example, would make it so they wouldn't have to get grade E stuff from some alley, we'd stop imprisoning people that may just need help and we could have discussions in the open about abuse. Privately vilify all you want, but the government should be mute on people's preferences as long as they are capable of making decisions, there's mandatory information disclosure surrounding dangerous drugs and companies can't lie about what they're selling.
Heroine for better or worse is a product that people are willing to go far out of their way to purchase and that goes for nearly all drugs. I would never do it and I believe if you made it legal, most people not doing it today wouldn't pick it up. We really need to get the idea that legal === government endorsement out of our heads.
We do things because the pros of doing them outweigh the cons of not doing them. Information around drugs, proper, honest and often, deters dangerous adoption.