[GlobalFrog]

And why not allow them now? If you compare the housing market to the job market, the general opinion (in the US) is that there should be very few restrictions for jobs in terms of low salaries and work conditions (and the lack of unions allows that). The same reasonning should allow to have low quality housing but cheap. But there are no downside for the ones who profit from employing people with very low salaries and very poor work conditions, whereas letting exist cheap housing indeed makes the property value around them go down. So it is really a choice made today not to reduce homelessness.