For the fourteenth year running, Japan's population has slumped to a record low. The non-foreign population dropped by nearly 900,000 — an unprecedented fall.
They’re not saying that Japanese people are trending that way, but rather that they will inevitably go that way for the same reasons America did and Europe is. The reason it’s not happening yet is because Japan simply doesn’t have enough foreigners yet; the cutoff seems from Europe’s track record to be around 5%*. More than that and they start getting scapegoated for all sorts of problems.
They’re not saying that Japanese people are trending that way, but rather that they will inevitably go that way for the same reasons America did and Europe is. The reason it’s not happening yet is because Japan simply doesn’t have enough foreigners yet; the cutoff seems from Europe’s track record to be around 5%*. More than that and they start getting scapegoated for all sorts of problems.
*As seen in this map (https://en.wikipedia.org/wiki/Islam_in_Europe#/media/File:Islam_in_Europe-2010.svg), percentage of obviously foreign people (in this case Muslims) and far-right politics are strongly correlated and other than Italy all European countries with a strong far right have more than 5% Muslims.