Disclaimer: I've only watched the anime.
When Yato gave Yukine a name, he immediately started suffering from all his "sins" and eventually an Ablution had to be performed to save both's lives.
Then why is it that he is not affected by Nora's actions? Unless he un-named her, which hasn't been mentioned. Either way, why doesn't he seek to kill her and end all these side problems that emerge because of her?
I am not entirely through with season 2, but similarly Kugaha's case confuses me too.
If anyone has answers, I'd appreciate them. Also, I don't care about spoilers, rather the opposite, if possible I wanna understand everything beforehand. This show sure is good, but it makes some mistakes in regards to explaining basic logic.