Freedoms aren't a reason? Lowering the senseless prison population? Using industrial hemp which is extremely beneficial to various area, even nutrients in the soil and making it harder for children to obtain. This was off the top of my head quickly, there are countless other reasons. You also give adults a safer alternative to alcohol which reduces the serious effects alcohol abuse causes.

Well, if there is less gang-crime, then gun-grabbers can't say "but teh gunz are ruining mah city"