> if used in a responsible way, the harm caused is practically zero.
And yet so many people struggle with using alcohol in a responsible way.
Alcohol is, incidentally, the only household-name drug that can actually kill you from withdrawal. Believe it or not, even though heroin withdrawal is miserable, as long as the person is taken care of and kept hydrated, they won't die from it. That is not true of alcohol; a person suffering from acute alcohol withdrawal can literally die from the direct effects of the withdrawal themselves.
In a pinch, opiates can actually be used to help a person detox from alcohol and mitigate the life-threatening seizures (and the pain). Benzos are much better for this, though, and are more commonly used in medical detoxification scenarios.