Even setting aside the matter of Bolaire, Halandil Fang has a long-standing pattern of ignoring or compartmentalizing the problematic behavior of people close to him.

It started about twenty years ago, when Thjazi was about to marry the Lady Aranessa Royce. Hal was with Thjazi and Aranessa before the wedding, when Aranessa offered up Thimble as a gift to Thjazi. Thjazi is immediately and justifiably disturbed by his soon-to-be wife giving him an entire person as a gift. “Sorry, the fairy’s a gift? I don’t agree with any of this.” After Thjazi’s repeated objections to what Aranessa has done, what does Halandil Fang have to say?

“Just shut up and say thank you.”

Thjazi is willing to believe that Aranessa can be wrong and make choices he can’t ethically accept. Indeed, it was only a year after this wedding that he left Aranessa because he couldn’t accept her choices and those of House Royce. But Hal does not want to believe this about Aranessa. He wants to smile and say thank you and not disturb the peace by making a fuss about whether it’s ethical to give Thimble as a gift or not.

Fast-forward to the end of the Falconer’s Rebellion, when Azune shows up on Hal’s doorstep with a plea from Thjazi to look after him. As mentally unwell as Azune is in the present day, I can scarcely imagine how fucked up he must have been as a sixteen year old war veteran with his home and family forever lost to him. As he spent time in Hal’s home, his behavior and reactions must have made it clear that Azune was severely traumatized by his time as a child soldier in the Rebellion. What any foster parent ought to start thinking in this situation is: “Did this child’s previous guardian do right by him? Or did he fail him?”

Except that Azune’s previous guardian was Thjazi, and nothing indicates that Hal ever took Thjazi to task for letting a child fight for him on the front lines, or for the mindset that his guardianship created in Azune, that he is a thing, a weapon, only worthy of care if it is bought and paid for. Just like Hal liked Aranessa and didn’t want to believe she might have crossed a line with Thimble, and would rather have just kept the peace, Hal didn’t want to disturb the peace with Thjazi by suggesting that he might have crossed a line with Azune.

As @everroth and others have noted, Hal’s biggest character flaw is complacency, wanting a peaceful, untroubled life without having to be reminded of the cost of maintaining that peace. Is it, then, any surprise that Hal has, once again, ignored and compartmentalized the fact that someone close to him might have hurt somebody else close to him, for the sake of his own peace of mind?