"Just… leave and live with what I have?"
Perhaps that wasn't the best thing to say to a person that has lost almost all of her people—but no one could really deny Diana-1's words. And judging from their faces, most of the themarians that Queen Adel was with actually agree with Diana-1's words.
Themarians, even before their annihilation, are a closed species; not closed-knit, just closed. Closed from the outside world, closed from the other species of the universe, and even closed from their own family. With their long lives, they have learned to be idle most of their lives—stagnant, completely unchanged by time.
In fact, a majority of the themarians left did not even feel like their species are on the brink of extinction, no. It even felt like there were many more of them than before—because now, they were more active than before and actually moving as a group.
