"And you think the best way to keep them from being dangerous to us is going out and hunting them down? Y'think it will stop at just keeping us separate? Not that it's bloody possible, we live in the same world and there are only so many 'pure' wizard families. Have you heard about inbreeding? You should have, we're a product of it." Sirius was kind of gratified that his brother at least had a somewhat more logical reasoning.