.... when it comes to any three letter agency from any bloody where in the world or any police forces or even those police forces with insanely bloated egos calling themselves law enforcement, because "WE DON'T FUCKING BELIEVE YOU, FUCKING PROVE IT" and the court of law is our appointed place for them to prove it (yes it has to be shouted because it has become all too blatantly obvious that they are not paying attention to basic required principles of law and justice).
You've got this wrong in multiple respects. Relations between the US and North Korea aren't governed by a court, so any talk of a court being involved in evaluating this is nonsense. Second, courts aren't simply "judges of fact" but are where the law is applied. The application of the law involves individual rights, limits on how evidence is obtained, limits on what can be considered in judging legal culpability. None of that applies to North Korea.
You seem have fave fallen for the common mistake of believing that nothing is a fact unless a court of law says it is. That is nonsense. Courts often have little or nothing to say about many imortant issues in society, including those of major political importance such as international relations.
You view is popular, but simply wrong.
The FBI and intelligence community are competent to evaluate and pass judgment on the evidence in this matter, and no court is either required to even welcome. This is not a matter for the courts.