It doesn't sit right with me that the anime/manga makes Brunnhilde sees Jack as the most despicable thing that walked the earth, more or less. She is far more objective and analytical to base things so superficially. Gods/valkyries, I am certain, have the ability to see the history and details of the person they select. Given this, she should have seen that he is not an irredeemable monster with no shred of humanity or morality. With the supposed bad, he has also done acts of good.
Based on wiki, he hunted down the worst criminals in London and got rid of even the original Jack the Ripper. It is questionable whether he actually killed prostitutes considering his ties--or simply took up the name of the original jack the ripper. Perhaps he did, considering what a piece of garbage his mother was or he didn't.
Either way, my Brunnhilde doesn't see him as a 'piece of shit'. She sees him for the shades of grey and complexities that is humanity. In truth, I cannot see her judging him for taking the lives of criminals or really, condemning him too harshly when it came to his asshole parents. The only thing she'd hold him accountable for was /if/ he murdered prostitutes that weren't dirty--in the sense they had no hand in the crimes plaguing London, abusing children or anything else abhorrent.There is a level of respect for his intelligence and ferreting out the worst of the worst in London.
So I perceive Brunnhilde to be more discerning and critical. She takes everything into account. Her intelligence is peak because she does not conform to the easiest and laziest explanation of a situation or a person. She's smart for a reason and that's because she looks past the surface, gathers information and formulates her own opinions based on her own guiding principles.
