Tunisia's Ghannouchi defends new government

Tunisia's Ghannouchi defends new government
http://www.bbc.co.uk/news/world-africa-12213284

In Tunisia a new government has been formed. They old president Zani al-abidine ben ali was overthrown last friday after a month of protest where 78 people died.
Tunisia's prime minister Mohammet Ghannouchi has formed a new government including some members of the old government, which caused quite a stir, but he defends his new governent. He says the retained ministers have 'clean hands' and that they can function well in the new government.

I dont really know what to think about this article. The thing I thought about while reading this was the upset about some of the former ministers staying in office. If a government for some reason isn't working or they are corrupt or whatever, that doesn't instanly mean that everybody in the government did a bad job or is corrupt. So why should it be such a problem if some ministers were to stay in office. (maybe because the new PM is somewhat loyal to the old president??( Plz let me know what you guys think.