We are all smart people here, and I didn't think I needed to clarify this point, but I will as it seems that my point is being misconstrued.
Yes, Desiree and Kaine have pleaded with Terri to give them the information to bring Kyron home; however, Terri doesn't currently have Kyron. Neither does Dede Spicher.
There have been a few times, very few, when Desiree has asked that Kyron be dropped off somewhere, but it hasn't been a consistent thread throughout the investigation.
I take issue with the argument that Desiree and Kaine are not appealing to the abductor* because he/she may get off on the attention. Many have asserted or insinuated (including Desiree) that Terri is a sociopath or has sociopathic tendencies. If that's true, wouldn't Terri get off on all the attention? And yet in interviews and press conferences the attention is always focused more on Terri than Kyron.
*for clarity's sake, lest there be any misunderstanding, by abductor I mean the person currently holding Kyron hostage