How do you intend to accomplish that? Remember we live in a world where people have accidents with cars, guns, and preparation of prescription medicines. You do not control everyone else, yet everyone else has the potential to alter your lifestyle in a few moments of recklessness or distraction.
Force majeur exists in contract law for a reason.
Accomplishing this is simple, but not necessarily easy. You make a choice.
As I mentioned, literally barring someone physically overpowering me and forcibly injecting me with addictive drugs, I will never be a drug addict because I simply refuse to take addictive drugs. Yes, that includes painkillers that may be prescribed. I took none of the hydrocodone tablets I was prescribed after my wisdom teeth extraction. I'm currently using non-pharmaceutical approaches to managing chronic back pain from an injury rather than relying on opiate painkillers which doctors are happy to prescribe.
I am not blaming people for their choices, but I am recognizing that externalities that feed into our choices don't excuse the outcomes.
Why? Barring someone forcibly injecting me with opiates repeatedly or the same with crack, it is beyond unlikely I will ever become addicted to either substance. I don’t think addicts are “bad people”, but once they’ve hit a certain point their physical desire for drugs overwhelms their ability to be present in polite society.
People should be treated with respect and humanity, but they also should not be given a free pass to do anything without consequence. If you’re shitting in the elevator or passing out with a needle in your arm in the restroom in the building it presents a clear problem with the plan of mixing luxury housing with subsidized housing.
I will never be in that situation because I won’t allow myself to be in that situation. I might become poor, I might need to rely on subsidized housing, but I will never be “someone who can not handle themselves” as the GP referenced.
I get that you’re trying to evoke empathy, but there’s a sea of difference in behavior and capability of accepting social norms between your average mentally ill substance abuser and your average poorer person who can’t afford housing. These situations are not the same and there does need to be a filter to ensure that the working poor do get affordable housing without reducing them to having to live alongside “people who can’t handle themselves”.
It’s not a nice thing to realize, but it’s the hard truth. We, if anything, should start providing state run mental facilities for long-term patients again. There are a lot of people who through circumstance or birth simply are not capable of coexisting with polite society.