"I simply cannot believe you have not thought of this, but to construct this narrative you must ignore these realities for why people flee their own environment in favour of a new (much more uncertain) one."
I did not refer race.
I am not ignoring but I am alerting that them may be BETTER served with cultures that conform with their ideologies and aptitudes.
Why create a cultural shock? Why make the person struggle to be accepted?
How many generations for me to be considered "japanese"? Or I would force japanese to me consider one of them?