well u know not only the french are not loyal also the italians. this is the new era of football. U can't expect from any player in the world to pledge loyality for his club.
The thing that hurts the most is the statement of thuram. I thought really that he loves juventus and he can sacrfice for this club. As for , Trez he was leaving before cappello arrives so i'll not be surprised if he desires that again now especially if juventus is definitely a Serie B club.
Buffon , the italian, is also leaving for sure to archrivals milan
zambrotta , the italian, is also leaving for barca or chelasea or real
So I don't see any diffrence between the italian and french players of juventus.