Just to clear things up, Trezeguet did not want to leave, but had to because the stupid board decided to present him with a new contract that was simply unacceptable for the player he is. That's why Bettega had to come in and rescue the situation.
Thuram was still technically assistant captain when he came out to say these various things, along with being on the payroll. If I were to show up to work and say, "Company who", while under payroll, that wouldn't be very smart, would it? They pay my fucking wages for Christ's sake. So, the answer to Thuram is, "Juventus, the team that pays your wages."
It doesn't matter if he was "betrayed", something that is up in the air anyway, nor does it matter if he wanted to find alternative employment. What does matter is the fashion he presented his views to his current employer, Juventus, and the people who pay his salaries, the club and supporters, something that would get him fired if this was anywhere but a major football club and if Thuram was anybody but a professional player.
But of course, football players will get all the fellatio they need from people such as Osman for this crap to continue.