I don't have a problem with it if folk do it at home behind closed doors, and don't then go driving with it in their system.
Conversely, I don't think legalising it will suddenly make all these criminal gangs go legit and start paying tax on their profits, corporation tax, business rates. Indeed, legalisation could inflate demand and give them even more incentive to keep at it.
Remember, the US is a strange situation. It is still against Federal law, even in states where it has been decriminalised (not legalised), so it's tolerated on pain of hefty retribution if businesses step out of line. The criminals are still merrily at it and are largely unaffected. Its a different product, in a different time, with different social customs, with a differnt culture around its use to that of alcohol and prohibition, so comparisons between the two carry no credence. Certainly the limited efforts to normalise it's use in parts of the US aren't stopping the villains.