[Nasrudith]

It is still not a good thing but is it possible or likely that many you witness are "capsule hoteling"? As in they have an actual home but are too smashed to make it home/others would be more pissed at them arriving drunk than the next day dissheveled and hung-over.

And yeah the only 100% end to homelessness in a society is involuntary institutionalization. Some people may decide they want to be homeless or can't organize themselves sufficiently to wind up at their home or even a hotel if money was no object. The latter is more justifiable but it is dicey for society to set thresholds. Out of sight out of mind is ripe for abuse even without bad intentions. Just bad assumptions and bureaucratic snafus can do plenty of harm.