To be fair, as a Dutch person, who can't imagine Joost to ever physically harm someone, we don't know what happened yet. Was there a (rightful) reason why he hurt (punched? pushed?) someone? Did the stress and tension of the event get to his head and he flipped at a tiny remark? Was there any remark at all?
It taking this long and the Israel connection seemingly non existant, I'm afraid he really did something he shouldn't have. There's even rumors about two incidents?
Sometimes people can be different under a ton of stress or in general when the camera is off. I didn't expect him to be like that, but we'll see.
What is a rightful reason to hurt someone at the ESC ?