I remember seeing favelas in Brazil next door to ultraluxury apartments 10 years ago thinking that this is probably what the future of the US was going to be like if wealth inequality steadily kept climbing. And here it is. r > g in the flesh - the other side of "the magic of compounding".
What could help them is psychological / psychiatric treatment, rehabilitation from addictions, and offering some better prospects in life than to get wasted every day. This is not a (purely) money distribution problem.