Since both players refused to comment on the incident, there are various allegations about what led to Zidane's violent outburst. His agent, Alain Migliaccio has claimed that a "very serious" comment by Materazzi provoked the attack.[7] Reportedly, the deaf forensic lip-reader Jessica Rees was employed to analyze the video sequences with the help of an Italian translator. According to these reports, Materazzi spoke in Italian - a language understood by Zidane due to his time spent with Juventus F.C. - and first told him: "Hold on, wait, that one's not for a nigger like you." As the players walked forward, Materazzi allegedly said: "We all know you are the son of a terrorist whore." Then, just before the headbutt, he was seen saying: "So just fuck off."
You can think less of him for losing his temper, but it's not fair to claim that he is crying victimhood.
See post #8.
Zidane calmly walked off the field, he knew he probably deserved what he got and didn't argue.