Unfortunately, due to the infrastructure (or lack thereof) in the US, you'd essentially be condemning them to death by doing so. They wouldn't be able to get to their jobs or a grocery store, because everything is too far away to walk in a reasonable time, and most of them don't have bikes and can't afford one on a short notice. So they'd end up homeless, and once you're homeless in the US, you've already got one foot in the grave. It'd be more merciful to imprison them.