Earlier quoted context omitted.
You can't keep humans in place, who don't want to stay in place. If you paid some benighted town in the Great Plains $500/head to accept your homeless, that town would just buy each transplanted San Francisco resident a sandwich and a bus ticket, pocketing the rest. It would soon become a joke on SF streets, "yeah I just got back from Nebraska!"
The suggestion was to put them in jails for defecating on the street, property damage, hard drug use and harassment. I'm not sure if you've been to SF lately or not but it's out of control. It's definitely not just innocent people sitting around, there's a large segment of the homeless population there harassing people, fighting with each other and damaging things. That's definitely breaking the law.
Lots of people would be really happy for SF to set aside some land in the city for new jails. Still, that seems less practical than just opening some public restrooms...