Schedule 1 is the most illegal that a substance can be. It means that it has no known medical use, high abuse potential, is considered dangerous to use and is generally unclean and verboten.
Ecstasy which is statistically safer than taking an airplane flight, is schedule one. LSD, which has little or no addictive potential is also schedule one. Alcohol, which causes enormous social problems and violence, is legal. Tobacco, which is highly addictive and kills around half of it’s long term users, is legal. That’s drug policy for you.