In my opinion, Sutil (like Alonso) is one of the most enigmatic characters on the current grid. It’s hard for me to imagine what is really going on inside his mind.
Adrian is not a typical racing driver. A far as I know, his parents (a Uruguayan and a German) wanted him to become a pianist and he was actually very successful in doing that. If my mind serves me correctly, he used to play concerts in front of relatively large audiences. That is, until the age of 14 when he realised that his feelings for motorsport were stronger.
I have noticed that Sutil always tries to sound / look very masculine. For instance, when asked which movie had made him cry (this question was asked to all F1 drivers in a series of interviews on F1.com) he replied: “I’m not a cry baby.” No other driver emphasized his coolness so much. And this is just one example.
Maybe this fear of being ‘unmanly’ made Sutil attack Lux after the latter one had e.g. laughed at him or whatever. But that’s just an assumption. Anyway, I wish Adrian good luck in the courts and hope that he gets acquitted and spends many more years in F1.