User blog comment:B214/Question and Answers 2/@comment-25222726-20140606202518/@comment-16281343-20140606203857

They don't value lineage since they can't reproduce normally in the first place and the only one who can create Angels is already dead. They can reproduce but they have to undergo a ritual which is very hard to perform and there will be risks of them falling.

That's why they resorted to reincarnating humans.

~And what do you mean by hierarcy of the Devils? Are you referring to the 72 Pillars?