I understand it like this: Heskey for once gave Oberyn back in similar style that Oberyn also tends flavor and generalize to the extreme. (I now read his comments trying to jump over the adjectives and colorful descriptions. It's too much really, and doesn't make his points come across stronger.) Now, I also do think Overdriven, although a fool, behaves way classier than Oberyn does, generally.
I was actually surprised that Oberyn would settle for a surprisingly realistic immigration policy though. I mean you get the feeling he wants to burn 1.3 Billion people.
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Anyway, I do think Fortress Europe is coming sooner or later. It simply makes too much sense for everyone south of the Mediterranean to escape their fucked up countries. And the better those countries do, the more people are enabled one way or another to try. And it's the best and smartest who will succeed, resulting in just another evil circle.