Maybe Mr. Schindler is reacting to all the stress of his daughter dying, the protests, and his own effort to save her from judicial murder. I can't judge him, because I'd hate to have walked the path he had to take.
If you are under that kind of stress, and then have all these damn press cameras in your face, you are not used to it, you are bound to act a little odd.
I know for a fact I would be giddy out of sheer nervousness and angst.