The wizard's vendetta against the Weasley family made a sick sort of sense. No doubt he would see the remaining children born to his wife's murderer as enemies he needed to dispose of. Seeking out Ginny to utterly destroy her was genius in a demented kind of way. Making her murder her own brother was dastardly and exactly what he would do. Rodolphus played the long game. Most might have rushed out in their anger and pain to eradicate as many enemies as possible immediately. And in those first several chaotic and violent years, he might have been successful in taking down a few. But, that wasn't enough. He wanted them to suffer. He wasn't going to be satisfied with anything less than complete annihilation of his enemies. Hermione worried about the remaining members of the Weasley family. While she certainly had had her differences and disagreements with all of them at some point, she hated that they were all in danger. Shouldn't the world be safer with the Dark Lord dead and buried?