While it pales beside the ICC potential, if you were one of them, would you risk travelling anywhere outside the US, never knowing when you might be seized for extradition?
It depends. I know that was the advice giving by the CIA, but until the Italian federal government registers these "convictions" with Interpol and the EU, they won't be arrested or extradited by any European country - theoretically. But, as I said earlier, there are probably plenty of other non-EU countries that would be happy to arrest a CIA officer. Suffice to say, it's a mess and it doesn't do anyone any good with both Obama and Hilary staying mum on the subject.