User blog comment:DeathGodPrayer/Talk About What You Want!/@comment-24098614-20140215083604/@comment-1359322-20140216021108

Sona's school is only meant for equility among low-class, middle-class and high-class Devil Children,  to change the view that reincarnated Devils are inferior to pure-blooded Devils. It's not to make the Devils change their view on their pure-blooded status. If the Devils start ignoring their pure blood status, then they can just quite being a Devil altogether. That status, the pure-blooded that the Devils are proud of is like their inheritage, the history of the Devils, it's not something they can abandoned period.

Imagine a situation like this, we live in a world where the number of humans are about 20,000-30,000 and there are orges who have millions of them. Suddenly one day humans decides that there is no difference between hybrids and pure-blood and start crossbreeding till there is no pure-blooded human left, can you say that they can still call themselves human in that situation.