And by Europeans here, I mean the EU, the govt of some individual WE countries and a small minority of vocal activist personalities who haven't got any other purpose in life. Most run of the mill folks I meet are either strongly opposed or negatively indifferent to migrants, in direct opposition of their govts.
Most countries could have just said no to migrants, like Poland, Greece and Switzerland did. But they all wanted to play the self-righteous card.
Additionally many blame the likes of Merkel for the self righteous stance unaware of the fact that she (and her Dutch partners and such) had the greatest effect on building down inflow with an agreement she started brokering with turkey well before her famous comment. On the other hand fences and hard rhetoric in Hungary or the like did not visibly affect the numbers of incoming refugees.
The Turkish agreement is meaningless - if all of Europe had been vehemently opposed to importing immigrants, immigration would have stopped at the Turkish-Syrian border. Immigration did not happen because of the Syrian war - it was a constant trend. What opened the spigot was the fall of hard regimes in North Africa such as Libya, Tunisia and North Africa (something EU biggies like France, Netherlands, Germany supported because "dictators bad!"), which led to their own borders becoming much weakened.
Third, no immigrant wants to settle in Hungary because they're immigrants, not refugees. And as immigrants, they're simply choosing the country with the best welfare. There was even an article in 2016ish I read (I'm sure there are loads) where an interviewee said that he was taking his family from Greece all the way to Sweden because the welfare benefits were better.
whose failure? Why are Europeans the default racists? The US is not even integrated and is going through large scale migration right now that has never happened before so the success of US integration is still too early to say. What does integration look like because the US has ethnic enclaves, everyone knows that.
It's absolutely right that the US promoted demographic change to Europe who followed foot but the migrants lack the skills who arrive and I don't think this even solves the problem. It may exacerbate the demographic trap for various reasons.