> "and diminish their country's cultural heritage"
Woah woah woah. Careful there, this line of argument has been used in the past.
Ditto with a previous mention of immigration making the country "less Japanese", which has shades of certain groups making a certain country "less German".
They have the right to. Is it a good idea for the long-term though? If the issue is that the birthrate is too low and the deficit you need to make up is, say, 300,000 people per year, then the numbers say you need to let in 300,000 people per year, which may be far above what a xenophobic society can assimilate (I feel like we're talking about Master of Orion 2 here btw :P)