i think a lot of populations could be more or less self sustaining, and could provide benefits for others as well. a lot of them have skills, construction, clerical, cooking. has anyone ever inventoried their skills? A lot have no fixed attachment to any one place (I am guessing) and will go where they think times will be better. Again, first and foremost, sort them out. Set up nicer hostels etc. farther from center of town. They need food and shelter, but it does not need to be on wall street or in front of buckingham palace. make sure they are assigned to an appropriate level of security and give most of them chores in lieux of salary. This does not all have to take a huge lot of money once things are set up. Again I am only referring to the lost their job and can't get back on their feet population, or the low iq never had a job because the factory went away population. You will still have the drug addicts, and can work with those next. Some can't be helped much, although all should be given a chance. A secure place where they can not hurt others with food, shelter, entertainment, and access to legal (or make some of them legal) drugs. It might end up being a hospice, but should be clean and warm and better than what they have now.