
Daewoo is saying that he doesn't regret MURDERING PEOPLE FOR HIS OWN SELFISH REASONS, you blithering neanderthals.
Nowhere in this chapter do they bring up the incident between Daewoo and the devil. They are specifically talking about how the OG Daewoo was a PoS and how the current one isn't really any better 'cause he doesn't think twice about taking lives, even if they are supposed friends. He was even planning on killing Woo-yeol at some point 'cause it meant that the devil's replacement job was successful.
Also, Woo-yeol is saying he forgives him for trying to kill him 'cause now, even if it's for his own personal gain, he's trying to help Seong-ah and Woo-yeol stay together.
Also, ya'll can hate him for raping the devil all you want, but the reason why it was "swept under the rug" IS 'CAUSE THEY ARE DEVILS DEALING IN THE BUSINESS OF KILLING PEOPLE. And we've seen that it doesn't matter if the person was intentionally "evil" or not. Woo-yeol was a victim of his father just as much as those kids, but since he never did anything to stop him the angels tagged him for replacement. It's shown that ultimately their system is morally bankrupt 'cause it doesn't take everything into account. The newbie angel even points out how wrong it is to judge Woo-yeol based on the dream simulations they put him through.
They themselves are not entirely free of evil 'cause their own business ultimately throws away lives based on theories and tests that are deemed unconstitutional and bankrupt even in real life. It's not that they don't care about Daewoo's actions, it's that ultimately they are demons/devils and morally bankrupt, lazy angels. They've done worse by their own standards even if it's supposedly a "righteous" job.