Some seem to be making a parallel of this immigration politics but for me this very much seems more like military research/power expansion like
@Thrembs said.
One might also say a bit of purity spiralling with the bloodline comment but then again someone of that outlook wouldn't approve of Ameri's existence at all as they'd consider the precedent even for experimentation too much of a risk.
The immigration outlook would want Merize sent home as soon as possible and keep interaction to a minimum as to not complicate the return.
The border control/immigration politics topic is fairly irrelevant given you have the fundamental practical concern in the plot (human blood), just like IRL (at greater numbers of people), as much as some would not like to admit.
This... happens. A lot. In the real world. You have people who grow up thinking they're awful, unsuccessful warts on society when it's what their truly evil family has told them all along. This is how bigotry breeds and survives.
The more I learn about the Naberius family, the more I truly RESPECT our boy, Kalego.
And in the opposite case, bigotry from the moralist child, their inability to consider their parents wisdom modestly branding them as bigots ironically.
Which is how bigotry is born from nothing rather than bred/spread.