Like Japan, or Bhutan, countries have the right to manage migration however they wish.  I&#x27;m also grateful there are countries which are more diverse like Singapore and India and the US.<p>People like to repeat the trope that diversity is strength that it&#x27;s invigorating.  But in that, the only diversity that matters is the diversity in thought, not necessarily in culture.  
There are as many successful nations which are diverse as there are those which are homogenous and there are as many failed nations which are diverse as there are homogenous.
  However, if you look at a Northern Ireland,  Algeria or Iraq or India, when trouble hits, it stirs up animosity among the groups who play the blame game.<p>In times of trouble or uncertainty stability is likely more likely retained the more homogenous the group as everyone is in the same boat and there is no one to scapegoat but the self.<p>From that perspective I can understand Japan, Denmark or Bhutan.<p>That said, some cultures integrate into the host culture more readily and successfully --Indochinese (Vietnamese) in France, or Chinese in France, for example, or Jews in Latin America, Indians in the US, Chinese in the Malay peninsula, than some others who retain or want to retain their mother culture and thus find a clash and harbor mixed feelings and alienation.