What they did do, was CHANGE the content in question REMOTLEY. They made no effort to have the ISP or the US goverment TERMINATE the hosting of these sites, what they did was (probably with a rubber hose and blackjack) get the username and password and altered the site.
I hate when people say something other than happened, I read the damm headline an just about panicked that they somehow did this through LEGAL channels in the US , THEY DID NOT
What they did is no different than what a 12 year old script kiddie could have done with a username and password. they changed content, there is a HUGE difference betwwen CHANGING content and "Shutting Down" a website, if the fellow had US cronies that were willing to host it the Italians could do absolutley NOTHING about it. Im half tempted to get a cached copy and host it for the fellows. Let the meatballs try and shut it down.