Ooh, another great chapter! Really going to make Dumbledore think about his non-actions in this one. 
It does point out that Dumbledore isn't really trying to curtail nasty actions by the so-called Purebloods against the Halfbloods and Muggleborn and their escape from the Pureblood society of Britain. Now, someone is and he wants to bitch about it. 
Boo-fuckin-Hoo! Go Harry and his supporters!! 
Can't wait to see what happens next.