It's Conte's fault, not Krasic. Conte is to blame for where Krasic stands today. You don't do that to any player in your squad unless they are basically bought to be a number in your squad. Krasic had a fairly good season at Juve, suddenly he was not good enough to even sit on the bench. This is devastating for a player's morale. Not for a player like Pazienza because he's serving the purpose but for a player like Krasic, you either make it clear to him that you count on him by giving him more chances to see if he can regain his form OR you sell him or at least never play him anymore if you are there to say he's got no place in your tactics.
The Krasic we have at our team today has zero confidence/morale, can't present himself, can't shoot, can't even run. He can't do the basics a footballer must know how to do and this is what Conte has done to him. It's ok if he is not in the coach's plans, but you NEVER play a player who has no place in your plans especially when you have already made it clear to him.