Obviously I don't agree with the abuse but it's a contradiction that people will claim Ozil is every bit as German as every other German with Germany ancestry because he was born and grew up there, yet meeting with the Turkish PM clearly shows that he feels an affinity to a country he has absolutely no connection to apart from genealogy. Then there's the aspect that he was politically campaigning for Erdogan so he aligned himself with his politics which in all likelihood is opposed to that of Germany. I guess most Germans feel a sense of betrayal, if in some hypothetical scenario war broke out between Germany and Turkey you would have to wonder where his loyalties lay - sort of like WW2 when the US imprisoned Japanese immigrants as a precautionary measure.