So you figure 5 million dead wood druggies die in your scenario?
Is that all? They can't face life without addled brains.
Realistically, why should the government support them? I just saw a documentary about a man who set some kind of record as the fattest man alive. 800#, 100% UK government support. He had 4 workers whose job was to wash him, 4 times a day, since he couldn't stand up, and his urine and feces were trapped in the rolls of fat. This was all on the government dime, because of his food addiction. Special beds, re-enforced floors, when they finally decided to do a stomach bypass, there was talk of a Seaknight helicopter to move him to the hospital. It was disgusting.
Maybe the Germans had a point. Life without living. He CHOSE to do this to himself. No one held a gun to his head. Same thing with druggies. These are not birth defects, or combat casualties. It's easier to justify than abortion.