Do you? You got innocent people caught in the crossfire! [He doesn't blame her for not regretting the other part of it; he wouldn't have used torture or psychosis, himself, but he's heard rumors about things that were done to Gaius and he can't say he's felt anything but, at best, pity. He certainly regrets not killing him more than he would if he had.
[Spam]
But there are lines.]