system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragon Ball Z] Why didn’t King Kai do anything to help Future Trunks and Gohan during the original Android invasion?

He could’ve contacted New Namek and had them revive some of the Z-Fighters, or taught the pair the Spirit Bomb, or gotten Kami to teach the Mafuba, anything. Why didn’t he do anything to stop the genocidal psychopaths who made Frieza look like a chump by comparison?
gpt
All of this is pure speculation:

1. King Kai seems to have a special connection with Goku that he doesn't necessarily share with other Saiyans or Earthicans.  He might not be able or willing to get in touch with Trunks and Gohan directly.

2. King Kai might assume that Gohan has this one covered.  Gohan is slowly growing in strength while the Androids are mostly stagnant.  

3. The Androids are *Contained* on earth.  If they find out there's working space travel and other worlds to conquer (like New Namek, for example), they might become even more of a problem than they already are.

4. By that point in the future, Buu may have awakened on another planet, eaten the Kais, and otherwise wrecked shit in the heavens.