You seem to be equating "homeless" with "drug addict". The article talks about taking away public benches because of homelessness.
There are different programs needed for drug addiction than for homelessness. Not everyone who's homeless has a drug problem, and not everyone with a drug problem is homeless.
That Venn diagram is pretty close to a circle, at least when talking about homeless people that don’t have a friend/relative they can stay with.
We didn't eliminate benches in public spaces because we wanted to reduce the presence of the nice, respectful, and polite homeless. We eliminated benches to reduce the presence of the problematic homeless, which has a much higher rate of drug abuse and mental illness.