Because you force their hand to not have another choice.
You removed the choice.
I love how authortiarians think that they'll get exactly their way. Suddenly laws of supply and demand disappear and they can shape the world at their pleasure.
>Where most people want marijuana, it gets legal. Where it doesn't, it's because people at large don't want it. That's it!
Or in a free society, people that want it, get it. People that don't, choose not to get it. Authoritarian is saying "I don't like it, so I will force you not to have it". The right to control one's body is a pretty fundamental freedom. You aren't supposed to be able to vote to take away the freedom of others. In an extreme example, you can't vote to make slavery legal. Laws can be immoral and unethical, and breaking those laws does not automatically make the law breaker unjustified.
> Where it doesn't, it's because people at large don't want it. That's it!
"People at large don't want", after the government spent decades brainwashing the population about the supposed dangers of drugs with sustained propaganda? By that standard North Korea and Russia are fully democratic countries, too, the population just happens to support things that their governments are doing!
You removed the choice.
I love how authortiarians think that they'll get exactly their way. Suddenly laws of supply and demand disappear and they can shape the world at their pleasure.