> How large of a group of people should be able to have secrets?
That's not really the issue. It's not a matter of the government being forced to tell you something. They can keep a secret if they can keep the secret. But if you can present evidence which you've gathered on your own, you should be allowed to present it to the court and be heard. And if the government doesn't care to contradict your version of the facts by presenting contrary evidence then they shouldn't have to, but that may mean they'll lose their case.
That's not really the issue. It's not a matter of the government being forced to tell you something. They can keep a secret if they can keep the secret. But if you can present evidence which you've gathered on your own, you should be allowed to present it to the court and be heard. And if the government doesn't care to contradict your version of the facts by presenting contrary evidence then they shouldn't have to, but that may mean they'll lose their case.