How does one achieve the official status of a "coup official"?

An army offical involved in coup? e.g. either gave orders to soldiers to participate, or did not take action against the coup when ordered so.

OK. So now we are limiting this to the army and leaving teachers and flight attendants out. And all (or many) of those army officials allegedly involved in the coup attempt eagerly "confessed" their erroneous ways, while none of them denied being involved in a coup?

That's what I'm talking about. If there is evidence about person X doing some criminal deed (shoting soldiers) that in itself is sufficient for prosecuting him. You do not need his "confession" for that.

The problem is about prosecuting 99000 teachers, academics, and other "inconvenient" people, without much more than a hint that they do not like you or that they make fun of your similarity with Golum.