Well, "why do you want France to lose ?" is a question you can only ask yourself when you're not living in France. Whereas in other countries, french football fans are mainly jerks.
Then, football players are waayyy too much paid for what they give : for instance in 2002, before every match of our beloved national team, there were loads of adds featuring each player...
And finally, I don't think that french people have the necessary humility to win anything :)