[Tsuwabuki]

Oh, I'm around. It's just my kanji skills suck, which means I have to be in a really 勉強して mood in order to deal with it.

Questions I don't feel you addressed:

Is 職務質問 conducted for the sole purpose of determining someone's immigration status? If it is, that's wrong. Perhaps legal in Japan, but still wrong.

Is 職務質問 conducted on Japanese citizens regularly for the sole purpose of determining someone's immigration status? If not, then a clear pattern of racism or at least of xenophobia appears, and that's wrong. If yes, then that is seriously interfering in the rights of citizens to be free of harassment from a government which is supposed to proceed from then, which is also wrong.

You say the same style of due process applies to 職務質問, but what happens if you actually do simply refuse to show ID and walk away?

If you do show ID and refuse to answer questions, but cannot be blocked by due process, how can the police ask you questions "for hours?" What are they going to do, follow you to the grocery store, the laundromat, your place of work, outside your apartment, on your dates with your girlfriend...? Never arresting, never blocking, but simply following you asking you questions while you ignore them and go about your business?

You say Debito was not arrested, but the question becomes, would he have been eventually?

In the States material witnesses can be arrested for obstructing a criminal investigation, which is a crime, and as long as due process, arrest, and Miranda are followed, interrogation can occur, but you still can't interrogate someone without following due process.

A Japanese police officer merely shadowing a citizen because the officer doesn't have the right to do anything beyond shout questions at you while you ignore him/her is utterly hilarious. And a waste of resources.

Also, Debito didn't "make" me think anything. I am responsible for my own views.