All I see here is the common kneejerk reaction to anything remotely criticizing marijuana. Elton John is a dry alcoholic and has been supporting other people with substance abuse issues for many years now. To him trivialization of any sort of drug use is negative. Calling it "the greatest mistake" is just some hyperbole to highlight the issue he sees. And he's not wrong in that there are many people, like in this comment section, who act as if there are no negative side effects to consuming cannabis. That is not only wrong but dangerous, because it is a drug and like all drugs it has its downsides that people need to be aware of. Still, personally I think decriminalization was the right thing. But stop acting like cannabis can do no evil.