A moot point by now, but publicly declaring a hack is a pretty good way of making it harder to actually prove fraud. Any potential defence will go along the lines of "hackers with malicious intent could have planted this evidence".

At the minimum Gox should be considered criminally negligent, but "publishing evidence of fraud" via hacking them isn't going to help bring legal action. I realise, of course, that this might not be the aim here. :)