I heard about the Zidane incident before I saw the game, so was watching for it. I'm sure it will be analysed to death, so all I'll say is that from where I sit it appears that whatever bit of conversation he had with the Italian player may have been the straw that broke the camel's back, and he just reacted badly. It could have been much worse. Any baseball fans out there? If you're old enough, you might remember what happened between Juan Marichal and John Roseboro back in 1965. http://www.nytimes.com/packages/html/sports/year_in_sports/08.22.html.
The one good thing the incident might do is take attention away from the French player who missed that second penalty kick. He's the leading candidate if and when the press and public start looking for someone to blame for the loss.