[mmooss]

> The problem is trying to create a system of requirements that is both feasible to put on paper and also testable.

... and fair, just, and respects freedom and other rights. Telling people one thing in 2015, giving them a decade to build a life in Japan, and then a decade later telling them they have to leave violates many of those things.

Obviously the political subtext is contempt for fairness, justice, and human rights. It's not hard to see how destroying the foundations of freedom and prosperity will turn out; you can see it already in the impact on many people who are immigrants and others outside a certain power structure (conservative, racially dominant, wealthy) in many countries. Removing human rights is license to act with contempt for others.

> In one case

One case doesn't indicate a problem. I don't believe it's dependent on any problem: Is it coincidence that xenophobia is suddenly popular in all these countries around the world, simultaneously?