There were 13 sentient beings on the planet, and with all the sensors still working, I would know if a 14th landed. I tried to stay on the good side of the other 12, given that they were the only sentient beings in the quadrant that I knew about.
But then they started to pick fights with each other, deliberately antagonize each other, and eventually it seemed like the only solution would be a fight to the death. No one would gain from this, I couldn't understand who would want this.
Then I discovered the planet counted as a 14th.