Politicians don't care about the long term. Their idea of 'long term' is the next election which is a maximum of 4 years, and far less than that in Italy... If they can spin things towards having their electorate think that they 'saved' Alitalia it will score them big brownie points. As it is 56% of the public think the present government is to blame, see this poll in a major italian newspaper:
Testata di repubblica - Repubblica
They will do what is necessary to save Alitalia in the short term. If the pilots and cabin crew reject the new contract, the politicians have the perfect scapegoat. If the rescue plan is accepted by everybody and the 'new' Alitalia fails in a year or so they can say that they did everything in their power to save Alitalia. The pilots and cabin crew unions are partly to blame for the present situation but I would definitely not want to be in their position right now...