On the flip side, I have a hard time imagining how a homeless drug addict will be able to kick drugs while on the street and then somehow find a house and then

On the flip side, I have a hard time imagining how a homeless drug addict will be able to kick drugs while on the street and then somehow find a house and then become a 'meaningful' member of society without support. They basically have two problems: no house and a drug addiction. Fixing the 'no house' problem without tying it to drug addiction is a step towards normalcy.