Korora
Let's keep calm here...
The Monsters Are Due on Maple Street: The aliens’ own people called them to account. Even though the humans still had moral agency and were far from blameless, the malicious temptation was utterly heinous.
To borrow from Shakespeare’s Othello (a similar story of malicious temptation):
“Tau Cetian dogs,
“More fell than antimatter or black holes,
“Look on the tragic carnage on this world!
“This is your work! To save the natives will
“Require diplomacy with skill and luck;
“Time is our foe. To you, Lord Magistrate,
“Remains the censure of these hellish villains,
“Of where and when and how they die! Enforce it!
“I’m for Majriti*, where I’ll to the state
“This loathsome crime with anxious heart relate.”
“Tau Cetian dogs,
“More fell than antimatter or black holes,
“Look on the tragic carnage on this world!
“This is your work! To save the natives will
“Require diplomacy with skill and luck;
“Time is our foe. To you, Lord Magistrate,
“Remains the censure of these hellish villains,
“Of where and when and how they die! Enforce it!
“I’m for Majriti*, where I’ll to the state
“This loathsome crime with anxious heart relate.”
* The official name of Upsilon Andromedae d in real life.