Let's flip that around, and ask. Why should society suffer the effects of your bad decisions? Even if you only harm yourself. Society has to pay the costs of picking up your body. Doing the autopsy. Putting your needle-tracked body into a hole in the ground.
Actually, in most locales your relatives are responsible for costs incurred upon your death. Hence things like "final cost insurance". You could use this same argument against any risky behavior that leads to a higher probability of death. Unfortunately, just about everything we do is risky in one way or another, and for most things we probably aren't even aware of the risks yet.