where would you put cass on the scale of "abnormal about the no kill rule" (or committed to if you want to be nicer) in comparison to bruce? based of off my memory purely they seem similar levels of committed to it (if i die to save one life it was worth it kind of thing) but i also think it would be accurate to say cass has a substantively different understanding and thus commitment to it then bruce because of her history, background, etc. at least thats my take, but id love to know how you would go about comparing the two in that regard.
This is a VERY juicy question!!! I am way more well read on Cass than Bruce so I probably am not going to answer this well, but I'll speculate based on my limited knowledge. Imo you've nailed it - I view them as being equally committed to the no killing rule, though with nuanced differences!
I think part of why they clicked so well is because they recognised a similar deep commitment to life in each other. If Cass thought Bruce was a fraction less committed (or vice versa), I don't think they'd have gotten as close. And she is pretty good at reading people so I think we can trust her judgement! The best way we can see this is the moments when they feel that the other's motivations are slipping:
Batgirl (2000) #6 // #48
In #6, Batgirl stops a man's heart to teach him a lesson; in #48, Bruce's plan endangers people/children. In both cases you can see how much hurt & shock Bruce and Cass are experiencing - the only person in the world who (they think) is as committed to non-killing slipping up is an unbelievable act of betrayal. Even more telling is that when Batman scolds Batgirl in #6, Batgirl looks heartbroken; similarly, when Cass confronts Bruce in #48, Bruce stutters over his explanation. Their relationship is built on the similarity of their dedication to life, but it's more than that. In some ways they are to each other the manifestations of their no-kill code. They both rejected killing before they met each other, but still the role they play in each other's lives is directly linked to not-killing. As Bruce says as early as Batgirl #1, she is him - their projection onto each other means their no-kill codes are inextricably linked. There's no real way to compare their dedications to the rule when in many ways their dedications are entangled with one another.
BUT it's true that their relationship to life is fundamentally different because Bruce was a witness to murder while Cass was a murderer. This difference manifests most (imo) in how they approach redemption. Bruce is pro-redemption, but he (tends to) speak about it as an ideal; he is full of guilt and he has failed but he is still a deeply idealistic person. Cass, on the other hand, takes it more personally. She is idealistic too but I don't actually think redemption is a rock-solid ideal for her, it's something she fights to believe in everyday, for herself and others. (Redemption as a shaky ideal for Cass is especially true in early BG 2000, like #19. It's not that she doesn't believe people can change but her self-hatred gets in the way!!)
All-Star Batman #4 // Batgirl: Secret Files & Origins
Bruce in panel 1 is trying to mentor Duke and Cass in panel 2 is talking to a stranger so interpretations of these panels will vary, but I think it's a neat illustration of how though they have the same beliefs, the way they manifest differs! Bruce is much more definitive in his assertion than Cass (who will never quite fully believe in her own redemption), but still they are both extremely committed to life and the power of change.
Um anyway long rambly way of saying they are indeed very similarly dedicated to not killing!! And though they do have differences (that they eventually recognise) I think in their minds the similarities far outweigh the differences. Their shared dedication to life, one that they see reflected in each other's every action, makes them kindred spirits ❤️❤️

















