I guess if you are found to be offering diplomatic refugee status to terrorists, and haven't been on the ball about dealing with them yourself, it is good to divert the attention from that to the evil US.
When Isreal rocket attacks terrorists in their cars, that would technically be a 'violation of sovereignty', if Palestine can be considered such. They still have to do it, though, because there's no other way to reach the people who organize attacks against them.
So, perhaps nations like Italy should consider how much worse it COULD have been. The fact that Italy has NOW decided to order his arrest just shows how they are trying to cover up the fact that they had dragged their own feet.