If alcoholism is a medical condition, then it is the same as continuing to fly whilst knowing you have, say, a dicky ticker, diabetes or a brain tumour, and hiding the fact. It's definitely naughty, you know it's wrong and it should be punishable.
However, alcoholics are usually in denial, are often depressed, and some would argue that drinking too much is just a lifestyle choice. And there are alcoholics who are reformed and teetotal who are perfectly splendid and competent people. So we need to police a system that give a nod to all of these facts.