Yes, these offenders are dangerous to society. Even with drugs like crack and meth illegal we have uncounted instances of people doing anything they can to get them. When they do get them, they neglect everything including jobs, spouses and children. Crack babies, meth babies. All of these things are very dangerous to society.
And of course, all of this is in glaring contrast to legal alcohol. Alcoholics are the very model of hard workers, devoted spouses and loving parents. And there's no risk to a baby if the pregnant mother drinks booze. Alcohol doesn't cause any dangers to society at all. After all, if it did, we'd be putting drinkers in prison and confiscating their property.
Have I misunderstood your assertions?
-ccm