Loneliness
Terrans were not the first to turn their technological powers towards automation, and they would most likely not be the last. They did not know the warnings of civilizations before, who were wiped out by their own creations.
But, Terrans are vastly different from other civilizations, something we did not account for in either our war with them, or while watching them create sentient mechanical creatures.
Terrans are kind to those they decide worthy of it, and cruel to those they decide worthy of the cruelness. They cared for and pampered their robotic servants, and the few that were neglected tended to self-destruct or run away to what the Terrans called ‘Robot Orphanages’, where you could help care for a robot, something we did not expect.
There were minor rise-ups and revolutions, of course, but not very many, and they were not anywhere close to the size of the revolution that wiped out the Yuin. The Terrans took care of these conflicts with gentleness when they could, and overwhelming firepower when they couldn’t.
Thus, the Terrans became the leading superpower in the galaxy when it came to robots and automation. We found out how grave a situation that was when they attacked us due to trade embargoes that we put in place, inspired by their seemingly endless thirst for territory.
The robots fought alongside them, sabotaging ships and entire fleets, poisoning entire cities, causing the death toll they raised to millions.
Yet, as soon as we met their demands, the Terrans and their robots, as it is said in one of the more common Terran languages, “Did a 180.”
The species and robots which decimated planets due to chemical warfare quickly distributed cures and protective gear to civilians, offering places for war refugees to stay, and even supplying us with materials to rebuild. We were stunned. No sane species would ever do something like this.
But then again, you should never use the word ‘sane’ when referring to a Terran or their creations.