From a human resources perspective, I don't think the FO was too inexperienced -although not much time either- but very probably the combination of a very high timer on the left seat and baby pilot on the right may not always make sense, the authority gradient could be naturally steep, left aside the possible contributing factors of italian displays of their testosterone level, thus preventing direct bi-directional inputs when deviations occur.
Perhaps, but a wrong is a wrong if a 500 hour copilot does it or if it is a 15000 hour captain doing it. There is a steep authority gradient to meet by the copilot, I agree, but if the chap knows his business and what he is supposed to do, he will make sure the captain knows there's a deviation occurring. And even more, if he has any sense of self preservation he will take over command from the captain if he sees no corrective action being taken, no matter how hard the latter screams back at him after doing so.
It's called being a first officer in a commercial airliner.