My point is that the context there being 'in Japan' and so the adjective is redundant (and exhibits the problems I've mentioned earlier).

And in that context he could say "The British police are awful" vs "The police are awful"

To compare. And then, yes, when it becomes necessary then yes, prefix with the adjective. In some cases it does make sense and aid communication.

I'm saying the blanket prefixing with the adjective is the problematic part.

It's fine if you don't agree, it's just a communication pattern I have noticed that doesn't seem to benefit anyone.