It wouldn't be just the people you don't like dropping like flies but many people you love as well. That's why the drugs were made illegal.
Taxpayers have about $200,000 invested in everyone that attended government schools. The government would go broke if half the students self-destructed before paying that back.
No kidding? Let's just keep incarcerating and killing them then. It was good enough for Anslinger. It's good enough for you.