As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.
On the other hand, "such-and-such a country allows quite a lot of immigration, and the niceness of a city inversely correlates with the number of immigrants there" is a stronger argument. Especially if I can get an even stronger correlation by conditioning on types of immigrants.
"... niceness of a city inversely correlates with the number of immigrants there"
Ask any Native American, ho ho.