Banning things has become more and more a “feelgood” measure in these modern times, where it is difficult even to keep abreast with what has and what yet hasn’t been banned.
I personally think potheads are idiots, just like smokers, alcoholics, and meth heads. They should be treated as such. Jailing them profits the prison industry, so I am for a more liberal attitude towards them. But liberalism today means not freedom, but gubmint subsidy. So, in no time, pot legalization becomes gubmint pot subsidy where taxpayers are forced to pay for the weed. Fairness and all.