We've seen Harry as an unreliable narrator before -- in Small Favor when Mab messed with his mind and his memory, and in Changes when he omitted significant events that had been wiped from his memory, and in another way in Skin Game to keep us in the dark about his clever scheme.
What if Harry is horribly wrong about both the Svartalves and the White Court, maybe even about Thomas?
We've seen Thomas keep secrets and manipulate Harry before to a lesser degree, like in Backup (for good reasons) and in White Night (less so). Could all of the scenes about Justine being pregnant and Thomas worrying about being a father *all* be a manipulation to get Harry acting on instinct?
If Harry had come out of the apartment (after watching Svartalves terrorizing Maggie) and started a fight... or if he'd tried to rescue Thomas... either would have constituted Mab's Winter Knight blatantly shredding the Accords within the first hour of the truce for the Peace Talks. It would have been a blow to Mab almost as serious as being kicked through several walls by Ethniu.
And we see Lara throwing the sex-mojo-whammy at Harry multiple times. It doesn't work to sex-whammy him, but it certainly does change the subject when he's asking uncomfortable questions about what's going on.
Big picture: the local Powers of the Accords are getting together for a meeting to discuss dealing with the Fomor, and Harry spends the whole book dealing with a prison break that could blow up the Accords and lead to millions of innocent deaths. It's sort-of like him to get obsessed with saving family, but it's unusual for him to so completely lose the big-picture plot. How sure are we that he hasn't been mind-whammied?
Could Mab have done it to him again -- perhaps as Lara's first favor? (If she just made him extra vulnerable to Lara's influence, it would explain why she needed to so graphically warn Lara against feeding on Harry, in their first scene.)