User blog comment:B214/Question and Answers 6/@comment-24098614-20171011123418/@comment-24098614-20171013150934

The way I see it they are a integral part of the world just like Angels have their heaven and the the other gods have their realms  there has to be a light to a darkness.

They have accomplished much as a race and I know for sure that he is not too happy in Issei's achievements either because Issei doesn't play the traditional role of a Devil like he should be meaning to be pure Evil like Rivezim stated to Issei n the story in how Devils should behave and act.

Issei is playing the role of a Hero something that traditionally Devils don't do because of the infamous reputation and lineage but there is always a first time for everything.