why isn't weed legal?

honestly, it's half as harmful as alcohol, IF THAT


it's so wonderful, just wtf is going on? :(

Many reasons.  It is a powerful narcotic with a potential for abuse.  But you've hit on the real point; that it's criminalization is arbitrary.  Used moderately it's claimed to be beneficial by many.  Abused, it's consequences are the same for tobacco users, with laziness thrown in, and no worse than those of booze, pills(the favorite of those who often oppose it's decriminalization), and yes, even food.
'At's right.  I's high.