Rorschach tries to find the logic in the statement, but he can't; she tried to kill someone, and only failed in the attempt because the victim managed to escape. The fact that she seems normal and innocent now is irrelevant; he can't separate the two aspects no matter how hard he tries, there is only black and white, nothing in-between. No 'conditional' evil, even for evil that comes in the guise of a child. He had stopped seeing her as innocent the moment she had decided to attack someone, no matter that the action allegedly wasn't her own. He makes a "hurm" of disagreement and shakes his head.
"And if it happens again? If she's more successful next time? I'm sure your congratulations on preserving innocence will be very comforting to the public then."
[visual]
"And if it happens again? If she's more successful next time? I'm sure your congratulations on preserving innocence will be very comforting to the public then."