"For those naive enough to think that the fact they haven't shared all of the evidence means it doesn't exist, well there's little hope for you getting far in life without your tin hat anyway."
You need to realise that they haven't shared any evidence. None. All they've done is make allegations and expect the public to believe them. In any forensic context the purpose of evidence is to convince the public or at least the public's proxies, jurors, of allegations (or denials in the case of the defence). In such a context evidence is what's presented and tested in court. If it hasn't been so presented it's not evidence, it's just allegations.
The question of whether to withhold intelligence material or present it as evidence isn't new. At some point, if you believe in the rule of law you either have to present that material as evidence and have it tested or shut up; just saying you have it doesn't cut the mustard. Having had a lot of your methods outed should make a decision in favour of disclosure easier - if you've got nothing left to hide... Another major factor here is that the US has taken retaliatory action. Even though it has done this without due process it might be wise to present the evidence that would have been produced had due process been followed.
For instance in this case it's being claimed that some messages were sent from addresses "used" by NK. In what way were they used? In their allocation block? In servers outside NK but used to host some service for them? If the latter, what sort of service? The Little Leader's Hotmail A/C?
We are seriously being asked to believe that someone who is capable of a break-in of this magnitude is incapable of covering their tracks in sending messages; is that so or is it more credible that someone who achieved the break-in is also capable of routing their messages to mislead? Sceptics have pointed out that the claims on behalf of NK didn't start until the media had made the link to the film; what's the timing of these messages from alleged NK servers in relation to that link being made.
FYI, although there were circumstances when a tin hat and maybe a Kevlar jacket would have been useful, I've got quite far in life. Part of that has involved looking quite critically at what information alleged evidence actually provided.