The Canadian city featured in the video below has housed all their citizens. I worked for a harm reduction program in San Francisco in which no one was required to be off illegal drugs nor were they required to be on psych drugs (the drugs of the state which were often held over the heads of those who don't want to take them as reason to not give housing) ... The program brought down emergency hospitalizations by huge numbers by giving people one of their very most basic needs...a roof over their heads...I'm a believer in non-coercive loving care. Give people what they really need and they'll figure out the rest.