The Sony hack appears to be the costliest in history. The embarrassment of Sony execs and the fact that the 'victim' is a movie, which may or may not have been a good one in the first place, may make it hard to take this incident seriously. But the idea of a foreign state - a hostile and vicious one at that - mounting a series of cyber attacks and terrorist threats to prevent the release of a movie in the US is deeply disturbing. Sony is just a company. And it was probably an easy decision in purely economic terms. But this shouldn't have been allowed to happen.