The problem with using bad behavior, alcohol, to justify other bad behavior, pot, is that the door is pretty much locked against anything that is not self destructive.
How do you justify accusing a productive adult who occasionally enjoys a few beers, a cocktail or two, or a glass of wine now and then as manifesting "bad behavior?" Do you realize how stupidly mean-spirited that seems? What you are manifesting is the
prohibitionist mentality -- the effect of which already has been tested, found to be
seriously counterproductive and repealed in the 1930s.
Your entire premise is based on the percentage of alcohol users who are negatively affected by it. Prohibiting the use of alcohol did not reduce that percentage but in fact increased it via the availability of, moonshine, "bathtub" gin and stock bootleg booze imported from Canada and Ireland.
The same situation presently exists where marijuana prohibition is concerned. Government has been waging an aggressive war on marijuana since the 1970s. The result has been no reduction in either use or availability but a dramatic increase in criminal enterprise and medical problems deriving from corrupted product and improper use. The undeniable fact is more than half a century of marijuana prohibition has achieved only counterproductive results. Yet the beat goes on in spite of the fact that one definition of insanity is doing the same thing over and over and expecting different results.
So would one best describe the prohibitionist mentality as stupid or crazy, or both?