Regulus grinned. "I never said that I want to ban killing, but murder," he said, enjoying this discussion a little too much. Very few people would keep up with him or even care. Remus would, but he was the only one. "I think that's where we differ. I think killing is on some occasions necessary. It's why there are justifications for killing and not for murder. You kill in cold blood, then you should go to jail. You kill in self-defense or the defense of others, then you shouldn't."
He shrugged. "My father was killed by your people for killing muggles." He probably should feel worse, but he accepted what his father had done and getting angry with anyone for killing his father seemed like a complete waste of time under the circumstances. "I wouldn't argue with that, but the people who want to find the information will anyway. You were a friend with Grindelwald, were you not? He went to Durmstrang and found the information, but Durmstang has been teaching the same thing for centuries and never created a Dark Wizard before. Do you think he wouldn't have found the information elsewhere? Don't you think that families like mine don't teach us before we even get to Hogwarts?"
He snorted. "I think we'll wave those requirements, together with that particular treaty." They would use what they found. If anyone wanted them to stick to regulated bottom thickness, they could provide new cauldrons. "Not that I know of. Potter said that all Dementors were kicked out after they supported Voldemort. So the jail would have been run by wizards. I guess the assumption is that everyone is dead, but maybe we should make a visit."