If I flee from my abusive parent, end up on the streets, with nothing to do and no hope and eventually turn to drink to blot out the deep untreated depression, should I be housed or vilified?
"so she probably doesn't want to work or get better"
Wow. Or doesn't know how whilst sunk in depression, or without losing the demons of 20 years of abuse or PTSD. Just as seen with ex services people who fight PTSD for years.
The trouble with "common sense" restrictions and limits is people often don't magically fix from depression, addiction, PTSD in neat allotted time windows. I would far rather have the world return to the British System (1900-1960s drug policy: "treat, discourage, but prescribe". Prior to the adoption of a US style war on drugs around 1970 we effectively had no drug problem. No policeman believed there was a link between drugs and crime.).
You may not be aware of this but many people in gainful employment are drinking or taking drugs, and addicted. Should they be thrown out of their mortgaged properties?
I contend it's cheaper and better for society to offer solutions unconditionally. Offer help for addiction, rough sleeping, PTSD, depression. Less crime, less violence, fewer police needed, fewer health emergencies etc.