"Well, they've never had much of a sense of self-preservation," And, like the situation with the mudbloods, Draco couldn't make himself care about Weasley getting herself killed by the Death Eaters, if it happened. He wasn't a turncoat out of any sense of guilt.
His hand caught hers, but the teasing question broke some of the serious mood that ad settled over him, and he rolled his eyes at her and then, after a second, gave a short nod. "It wouldn't do me a bit of good though, would it? I don't feel like wasting my breath tonight."