Yeesh, not a good chapter for Dumbledore, Sirius or Scrimgeour. Of course, they deserve any and all negative responses. Sirius and Lucius' plan is madness, and Harry's observation is only why it wouldn't work, not why they shouldn't do it. Dumbledore is...Dumbledore, and Scrimgeour is the classic ignoramus ministry employee that doesn't understand Harry well enough to respect his opinions.
I don't know why I just went on that mini-rant. You know how all of the characters are, and it's not as if I'm complaining about the story (or if I am, I don't mean to).
So to put an end to this increasingly disturbing review, I enjoyed that chapter immensely, especially Harry's surprise appearance at the end, and am looking forward to the next one.