Carlisle shrinks just a bit, her reassurance this isn't on his shoulders not changing his mind in the slightest. He does appreciate the clarification, however, privately.

"This has been their nature since we arrived. It was only a matter of time before it wore me thin, as it does everyone."

Unfortunately, he has ended up nearly threadbare, and no amount of aural or physical patchwork that he knows of can fix what's left of him.