Why the fůçķ can't modern American and European society just legalize open public use of weed, shrooms, and opium?

I think it's backwards that I, an adult male, can't bring my roor glass bong to a mall or store or a bar and take heavy rips of weed mixed with opium latex while eating like 10 grams of shrooms. If it was legal I would legit burst my lungs ripping from a roor bong at a mall or bar or Walmart or target smoking weed with opium balls while on like 6 grams of shrooms.
Why the fůçķ can't modern American and European society just legalize open public use of weed, shrooms, and opium?
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