Re: Kirk, the PD, "The Omega Glory" and "Miri"
Tracey had already "contaminated" the planet by taking sides with the Comms and using phasers as well as arming the Comms with the phasers he took from Kirk's party. Advanced tech had already been introduced. Kirk "explaining" the meaning of the Yangs' document hardly complicates matters. If anything it might prevent further bloodshed...but I doubt it. And how do we know the natives hadn't already seen Tracey's original landing party materialize out of thin air and then disappear later as they went back to the Exeter.
I would think it likely that the Enterprise team used the coordinates already programmed in the Exeter transporters. Seems like the quickest way to find Tracey if he was still alive.
"If I hadn't tried, the cost would have been my soul." - Admiral James T. Kirk, Star Trek III: The Search for Spock