Intertemporal Communication? II

In Poul Anderson's Starfarers, a holont time communicator spins a massive particle and thus opens a time warp through which information can be sent into the past.

In James Blish's The Quincunx Of Time, a Dirac transmitter controls waves generated by a positron, thus causing an electron to appear in other apparatuses and thus sending messages to anyone who can receive them in any part of space-time.

Anderson's holonts (quantum intelligences) communicate quickly and easily with newly arrived human explorers because their future selves are able to tell them how to do it because they remember having been told how to do it.

An organization called the Service monopolizes the Dirac transmitter. The founders of the Service decided not to meddle with foreseen events but to ensure that every such event occurs on schedule. Anything else would be hubris. This policy has increasingly Utopian outcomes but why?

My argument (not Blish's):

(i) the Service receives a message describing an event, X, only if such a message is transmitted;

(ii) such a message is transmitted only if X occurs;

(iii) X occurs only if the Service causes X to occur;

(iv) the Service causes X only if (a) the Service has received a message describing X and (b) to cause X would not be morally repugnant to the Service (e.g., they would draw the line at committing a massacre);

(v) therefore, the Service receives a message describing X only if (a) the Service receives a message describing X and (b) if to cause X is morally acceptable to the Service.

(a) is tautologous and can be deleted which leaves:

(vi) the Service receives a message describing X only if to cause X is morally acceptable to the Service.

The Merseians would use a Dirac transmitter to conquer the galaxy. A sequel to Starfarers might have drawn similar conclusions about applications of holont time communicators.