And also to add to this: OK, assume that you won the point. 75-80% is totally not "almost 100%" and only 65% of people become homeless because of drugs.

So what next? Building more housing won't help drug addicts that are _already_ addicts. Even if you believe that it might prevent future homelessness (spoiler: it won't), we _already_ have hundreds of thousand of hard-drug addicts.