Okay, I should back up and explain. It turned out that the war had been even worse than we realised. The pureblood population was devastated. Muggle-Borns had had it worst because of the MBRC, but purebloods had suffered high casualties, too—ironically, higher than half-bloods on either side. For the new regime, for whom blood purity was everything, so many purebloods had died that it was a demographic disaster, and now, in their estimation, they needed as many pureblood witches and wizards as possible alive and making babies to get their population back up. Neville, Luna, Ron, and Ginny were all purebloods, so they had little choice but to set them loose. As for me, it was a little more complicated.