It's not a debate in the scientific community, of which I am a part. There are no known genetic or biological causes of alcoholism, or any mental disorder for that matter. That's the real key point to keep in mind. Would you call nicotine addiction a disease as well? The causes and symptoms you describe are virtually identical.
However, I often think that it is a matter of semantics. I notice that you also call diabetes a disease, when it is in fact not one at all. It's caused by an improper functioning of the pancreas, resulting from genetics, abuse of the organ, or a combination of both. Psychiatric disorders in particular are commonly miscast as 'diseases' in order to sell pharmaceuticals for symptoms that don't even have an identifiable cause. You bring up a secondary reason with your last comment, which really illustrates my point. It's called a disease for social reasons, not for scientific ones. I don't blame people for not being aware of the difference and I'm not surprised in the least.
All that being said, I have seen alcohol addiction afflict colleagues and family members and it is terrible. I fully support efforts to reduce the stigma around alcohol addiction and to help people that have problems. I'd be very surprised if our views were any different in that regard. I just don't think that the problem needs to be mislabeled in order to achieve that goal.