> How is it different how ACTA got negotiated
  > and signed and how copyright policy

It was a matter of 'national security' that no one outside of the negotiating body could see it... except copyright lobbyists. Apparently members of Congress (and members of other countries' legislative bodies) are a security risk to an international treaty that's all about how to deal with copyright infringement, but those copyright lobbyists are all on the up-and-up...