@JianNg
He does care.
"Love can be twisted in so many ways" , they said.
He actually remember the child he sacrificed, not only their name but their background and motivation.
Although He used them for his own advantage to reach the "Dawn" which in 2000 years (will definitely happen in future because time difference between the depth and earth mantle), he still care after all, even those who weren't choosen and turned into narehate.