Parent was talking about Japan not the US. In most of the world, the police will leave you alone unless they have to intervene. In Japan, they’ll probably want to really help you and not add an arrest to their record.
> From there, if you have nothing to officially prove your identity you might totally spend a while at the station, and potentially have them kindly escort you to your home so they get a look while you're looking for your passport
Again, highly an American perspective where the police is fishing for arrest reasons. The rest of the world doesn’t allocate much resources to the police so they bus around people without very exigent reasons.