Police Are Useless: The TDI NPCs are, to a man, completely and utterly incompetent at anything to do with their job descriptions and consistently need to be bailed out by the present-day protagonists who, per the Temporal Prime Directive, shouldn't have been allowed to become involved to begin with.Doing so prevented a peaceful democratic Cardassian government from forming and saved the life of Gul Dukat's father. Case in point, in the Tier II Transmission, you find out that Commander Nereda is forced to aid the Obsidian Order on her homeworld of Cardassia Prime in stopping a bombing by a dissident group.
Given the nature of this work, it has a presence before its establishment in the form of temporal operatives active throughout history. A coalition of the signatories of the Temporal Accords, the TDI will be formed in 2769 to safeguard the signatories' shared history.