These guys drink the whole day, the very definition of alcoholics. And they still have plenty of spending money. I don't know what evidence you have, but it sounds like it's pretty much just a "tell that."
Are you referring to delirium tremens being fatal, or the symptoms of DT and the onset of other factors being responsible for death? A critical distinction, I think that deserves being called out
These guys start shaking if they don't get alcohol. I've had to give them some of my valium script because the liquor store was closed one night and we visited one of their friends in the hospital. Again, where is the evidence for your claims? Have you ever befriended any homeless people?