Zane did what Fox Mulder didn't or couldn't do.

Expose the truth to everyone.

The one thing that was pathetic about Mulder was that he was trying to expose the government. The very government he worked for. He thought he could do it by still being a government agent. You can't expose this kind of truth and still think that you can do it by working for very people who cover up this stuff. Even after everything that Scully saw she was just getting pathetic by every episode. And having a parther like that didn't help one bit. Mulder also wasn't that careful when he had proof right in his hands. What Zane said at the end of the movie is something Mulder hasn't thought of.

"You tell them. You go back and you tell them that I know. That she knows. That other people will know! It's not going to be easy. Not anymore."

The truth will or would have people going crazy but who said it was going to be easy.

Mulder had so many chances and he blew it too many times. Those men in the last episode of the X-Files were right when they said he failed.