Well, first of all, it comes from countries populated by brown people. White Americans don't like the idea of brown people having such a lucrative cash crop. The liquor companies especially do not want another drug competing with the one they sell.
Then, there's the fact that marijuana is associated with hippie culture, and hippie culture is associated with laziness, moral ambiguity, and unwholesome values. There's also the fact that it makes you absent-minded and forgetful -- people associate marijuana with stupidity, immaturity, and irresponsibility.
The main reason marijuana was illegalized in the U.S. in 1937 -- besides pressure from the liquor companies, who, at the time, were just making a comeback after Prohibition -- was a Propaganda campaign that claimed marijuana caused Mexican men to go crazy and rape white women. White men will do anything to preserve white womanhood from the so-called primitive and bestial advances of brown men. Illegalizing marijuana was also thought to be a good way to repress Mexican Culture in America altogether.
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Because society has deemed it wrong and if it were to be legalized the government would look unreliable due to all of the false information distrubuted by them. "it's a very strange thing when you make nature illegal" - The Union