Interesting postulate, but as I recall drugs, alchohol, and other forms of chemical imbibement were never cited as a fundamental right of being a US citizen. In fact, at one point, alchohol was specifically prohibited.
Nonetheless, I would say what is being done in our forests has less to do with the legalities of drug use, and more to do with corrupting the fiber of our society. The question isn't whether growing or using marijuana is okay, but that evil people are abusing and destroying a natural resource without any remuneration or accountability, while at the same time depriving the rest of us of the use and enjoyment of our public property. Whether any of us would legalize drug use or the growing/manufacturing of it is irrelevent to the real issue, which is one group of people wantonly trampling on the rights of others without consequence for purely economic reasons.
That, my friends, is what is most unacceptable about this situation. That is what we should be fighting against with all our effort.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)