Catching up on Father Z this morning, I read his piece on the Holy Father's canceled visit to "La Sapienza" University in Italy because professors and students were protesting madly and his security and dignity could not be guaranteed.
I was referred then to Zadok, who has all the details on the ground:
I don't have much to add to this myself beyond what Father Z and Zadok have to say. In the comments to the various quotes, a lot of biblical verses are quoted to support His Holiness. Dusting yourself off after being thrown out is a good one, as is the story of Peter turning back to Rome after Jesus asks him where he's going.