You can say that, but it's very, very incorrect. Seattle spends $1 billion on services, clean up, housing, and etc. for a homeless population of 12,000.
They'd do better just giving these people $1500/month to live on, along with some counseling services to get them reintegrated into society.
Every place that has had significant success in combating homelessness has done what you say. They've payed less attention to the "social ill" side of the token and have just put people in houses.
It's just not feasible for anyone to live in this city on only $1500/month, even if they don't require any social services.