countries need to be incredibly hardened against immigration because even small slipups cause such unbelievable damage.

You only need a short period of retardation - or treason - to do permanent damage, because after that, others will say that it's impossible to deport immigrants because """"""""citizenship"""""""".

Also, while you're mostly correct about Japan, I don't think housing is affordable. It's cramped and expensive, as far as I know.