Here is the short version DUmmy.
You progs are always spouting off about how legal pot would be a financial boon to states, who could then tax and regulate it as they do tobacco & alcohol. The failed proposal would have made certain that laws were followed and taxes were paid - yet many potheads voted against it -- because the truth is that isn't what you want, is it ?
You want to grow your own in cardboard milk boxes on your windowsills and pay nobody any taxes whatsoever. - The "tax it" option is your thinly veiled attempt to make it appear that some good will come from legal pot.
Growing pot is easy. any stoner can do it -- compare that to growing tobacco and making booze. Tobacco has a very specific set of requirements to grow properly. Booze is difficult to make tasty, and if you mess up on the ingredients, you'll make poison instead.