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Regulus Black realized that he was actually a cancer to this society and went offline bcz he thought he really did something /jk
ngl, if you believe that Regulus's true beliefs are unknown as the only piece of canon information we have on that front is from Sirius, which could be biased because of the animosity between them...I don't think you can say Regulus took revenge on Voldemort for Kreacher because we learn that from Kreacher himself, an elf that literally worships him. So for all we know, Regulus could've been a blood supremacist/voldy fan, could've been not, could've loved his elf, or could've seen them as inferior beings and only betrayed Voldemort simply because he knew Voldemort needed to be stopped.
...im not saying anything, im on the side that he loves his elf, but I was arguing with someone about Regulus as a character and they told me what's mentioned above. That Sirius's dialogues on him aren't reliable for that reason and that Regulus defected when his elf got hurt.
So it's just...idk man.