That's not a very good threat. Diversity is Europe's strength and they will be welcome with open arms!
Individuals might feel that way but governments are happy to have then detained in Turkey.
Even Sweden would probably not open up for so many refugees and several Eastern European countries refuse any. (EU might be able to force them).
I'd like to point out that it is a notion held by a minuscule % of the population.
https://www.pewresearch.org/fact-tank/2016/07/12/in-views-of...
And I believe that the opinion held by majority matters more than the notions held by a minority, however vocal it might be. This is how democracy works, doesn't it?
Call the bluff.
Furthermore, the US currently is a lot more xenophobic and less accepting of foreigners than Europe is. I'd even go as far as say that in my experience Americans in general tend to be more racist than Europeans as well. And let's not forget USA's far from spotless historical record of treatment of minorities and other groups deemed to be 'different'.
Just like the current xenophobic attitudes among some in the US is a choice and was a choice in the past. None of this is excusable, none of it is inevitable. And I have little patience for "realists" who carry water for the idea that xenophobia is inevitable and unchangeable.
And not that it matters to the discussion of whether it's inevitable or not, but Americans are more welcoming of immigrants: https://www.nytimes.com/2015/12/09/business/international/fo... and have lower demonstrated racism than most of Europe: https://www.washingtonpost.com/news/worldviews/wp/2013/05/15...
And forget the anecdotal data. The bulk of Americans interact with folks from all around the world, daily, with little issue. America's a big place, and its easy to cherry-pick news reports to get any impression you like.
Here's some data: racism by demonstrated tolerance. America is at the bottom of the list:
https://www.washingtonpost.com/news/worldviews/wp/2013/05/15...
https://www.dhs.gov/immigration-statistics/yearbook/2017/tab...
Secondly, these new citizens are truly multicultural, as they literally come from every part of the globe - opposed to the refugees coming into the EU who are mostly from a middle eastern cultural origin. Because of this new immigrants coming into the US rarely have the luxury of arriving in a group of people similar to them so they are pretty much forced to assimilate.
Lastly, the geographical position of the US and their immigration policies allow them to be able to sift through the millions of applicants and pick the cream of the crop. Winning the dv lottery is not unconditional - it's only the first step in a series of screenings and checks one needs to undergo before he's even approved to become an american citizen. This is the polar opposite of the migrant situation in Europe where millions of people are simply passing through county borders without barely any supervision or control.
This is making excuses for a cultural choice.
Removed posts appear as [removed] only if they have children (and, I believe, only mods can remove posts that have children). A post with no children that is removed by its author or a mod simply vanishes.
The tag HN uses is not [removed] but [deleted] and yes, if the post has no children, we don't bother displaying that. It's just there as a placeholder in comment trees. More importantly, though: mods never delete posts unless the author asks us to. The most we would do is kill a post, which shows as [dead] and is visible to anyone with showdead turned on in their profile.
There have been a handful of exceptions to that in 10 years, a couple accidental deletions and a couple that the legal department told us we had to do, but it is as solid a rule as we have on HN.
Absolutely not, and I appreciate what you do. It's very uncommon to see someone with the necessary set of skills to effectively maintain a community and put up with people like me. That also includes calmly explaining over and over again the decisions that have to be taken to moderate this site without falling for the "I'm doing this because this is the way it is/because I want to" argument.
Or, I make my reply, and decide that it was too harsh, or that I misread the parent.
Last refugee crisis destroyed any future plans for expansion of the Schengen zone, helped Brexit and propell right wing parties at elections in EU member states and also further distance the southern states from the north as they were left to deal with the crisis alone.
Edit: I'm not blaming the refugees, I'm highlighting that if Europe was so united as you suggest we wouldn't be having these issues but currently, as you can see, Europe's policy is every man for himself and the refugee crisis helped expose problems Europe already had.