Its ironic that 1924 Japan, the most racially “pure,” nationalistic and arguably the most xenophobic/racist country in the world would criticize the USA on its immigration policies.
We hear similar hypocrisy from countries like China and others in 2024. They don’t care about their outright hypocrisy, they just want to shame the USA.
I suspect it was because Japan was sending a lot of spies to the US.
And you know that is precisely what China is doing now.