Skid row isn’t abandonment, CA spends $47K per homeless person per year in direct and indirect assistance. It exists as it does due to intentional and well funded policy.
Even granting that (which... no. How is it true? Any evidence?) it's still less inhumane than what Japan is doing here. The conditions amount to torture.
The fact that many people opt to falsely plead guilty and get a reduced punishment in a society that highly values honor and saving face should say a lot about it.
Californian spend on homelessness is public info, you’re free to search it yourself.
There is something about seeing drug addicted zombies impossibly contorted in on themselves and swaying in the wind that appears very inhuman to me. If given the choice, pre zombification, of a false confession or life as a zombie I know which I would chose.