The data shows that the biggest factor is the increase in rental rates relative to income. Drugs and mental health problems are more of symptoms of poverty and a terrible health care system.
If you want to put it in the simplest terms, the increase in homelessness is caused by wealth and income disparity.
Yup. And there will be continued efforts to completely ignore every bit of data that definitively shows the ruling ideology to be the cause of the problems because that would mean rich people gaining wealth at a slower pace.