Of that list then, Tokyo is the model to follow - what are they doing right?
A complex question/answer.
One that starts by admitting the homeless are probably under-counted in Tokyo, for a variety of reasons. The number is still likely quite low, relative to other major global centres, but a bit worse than statistics indicate.
The reasons for this are that begging (panhandling) is illegal in Japan. There is also a strong element of social shame in being homeless, for those two reasons, the homeless are a less visible population in Tokyo.
You see very few people, if any, sitting on a sidewalk with a cap out. When the homeless sleep, outside, it tends to be in nature, and as well hidden as is practical for an urban area. Not in a door-stoop or a park.
The internet cafe culture, pre-pandemic also masked the extent of the problem with ubiquitous cafes operating 24-hours a day, and many, yes, many offer showers, in addition to food, drink and washrooms.
Now that said, there is a real, if smaller than typical, homeless population.
Again, part of that is panhandling is illegal; there is also very little tolerance of homeless people in the public realm, so the dis-incentives are strong.
But its also some of the positive programs as well.
The above is taken from:
https://tomorrow.city/a/homelessness-in-japan
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Additionally one has to factor in the different way families are enculturated in Japan. There is a strong sense that the under-performer/black sheep is your problem, and you must accept that burden.
So Japanese families are more likely to house a problem child/nephew/brother than might be the case here, or to employ them etc etc.
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I think we could learn from them on the employment side; I'm not sure that most of the other unique ways in which Japan addresses this type of problem would translate to our own society.
But its not as if we don't know the answers.
We need greater institutional care, and supportive (semi-institutional) care for people with mental illness and addictions.
We need a social assistance system that focuses on getting people the housing and benefit they need, not on generating paper work and throwing up obstacles to success.
We need more deeply affordable housing; and better mental healthcare and addiction treatment services.
That along with tackling poverty would go some distance on tackling these issues.
So would setting up even a couple of high school classes (not courses but days) of programming where kids are given the info on where to get help if they need it.
We could certainly consider the more punitive aspects of the Japanese system; but it would be terribly unfair and unkind to do so if we haven't first put the supports in place for a more compassionate approach.
I hasten to add, however, the Japanese would never tolerate open encampments that we've seen here, and I imagine protests might be something of an issue if we began to take a harsher line.