The reason why this "might" be a cruel act is that Noland Lee and Denise Green were unable to determine whether Latifa willingly allowed Plin to transform her into a monster.
There was a very small probability that after Latifa woke up, she would not only be ungrateful to Noland Lee and Denise Green, but also hate them for killing her Contractor, interrupting her slumber, and preventing her from seeing outer space.
This probability was not impossible.
According to Denise Green, Latifa signed the contract with Plin while they were passionately in love.
Being in the state of love, Latifa might have accepted Plin's plan without much thought.
After all, to her, not being able to perceive the outside world might not be a bad thing.
As long as she believed that her Contractor could take good care of her, she could fall asleep peacefully.
The moment her mind woke up, her feelings towards Plin would remain unchanged, still passionately in love.
