A Galactic Unification League ambassador spoke to One-Earth's governing council.

"Yes, we all have Planet Destroyers. Much like your MAD."

"So why won't you intervene?" asked a councilperson.

"We sympathize that you suffer catastrophic losses, but we cannot cause a galactic meltdown. So, we'll supply your people with forcefields and shockers for self-defense."

"The invaders will soon dominate and enslave our entire planet," another councilperson pleaded. "Surely one PD will protect us."

"We've considered that, but based on your continuous warfare for over several millennia, we've no doubt someone on your planet will use it. You're too great a risk."