If we're throwing cliched adages around, don't throw good money after bad. People flock to places like SF and Seattle in part because they have all of this spending and infrastructure for the homeless.
Any evidence for that? I have a hard time believing people are moving to 'Rain City' to live outside.
We host the county jail and courthouse, and in many municipalities it's illegal to be homeless, so they get picked up there, jailed here, and released here.
If I were homeless I'd try to go to a place that helped homeless people.