I would agree if it wouldnt be about Bruce and "failing" wouldnt be mowing down thugs in a ruthless manner.
The whole no killing thing is a huge part of what makes Bruce batman.
Its the whole fundation of him being Batman, preventing death at the hands of others with all he has.
Everything that drives him is the wish that nobody else has to feel what he felt when his parents died.
Every death he cant prevent, every criminal he captures but kills again and again...is his failure, something he shoulders, something that is his burden that he carries with himself.
His no Killing rule is something elemental inside of the character that when taken away, can not be regained.
Yeah you can have him do it and have redemption, but you cant go back on him breaking something as important as his vow not to kill anybody.
Especially considering in BVS he activly, knowingly kills...its not an accident like the thing with the grenade...no he acts knowing he will end lives.
There is no going back, no making up for that.
To me at least, so there is no way Afflecks batman could or was "my batman".
For that he already reached the point of not returning to his ideals and what makes the character.
Its why for me personally he isnt the batman i always wanted.
My batman was already broken and lost when his parents died.
To me not even at his lowest, Batman activly ends a life because it betrays what the character stands for.
Thought it made more sense to respond here, hope you don't mind.
Batman is very flexible, over the decades he's had hundreds of incarnations, and a few of them have been killers. He kills every now and then in the comics and quite frequently in movies. Yes, most versions would never kill, most versions would also never dance the Batusi but that doesn't invalidate Adam Wests Batman.
Whether Batman should have an iron clad no kill rule is debatable, I can understand you stressed "my Batman", indicating you're aware this is more a matter of personal preference, which I respect.
In terms of redemption it is only possibly if you are guilty, if you have committed crimes, sins, betrayal.
Someone who has been true to themselves and stood by their convictions doesn't need to be redeemed.
Afflecks Batman does betray his core principles, this is why he needs redemption.
Yet despite the terrible things BVS Bruce does, he is not irredeemable. He is still capable of rededicating himself to righteousness, he can still be a force for good. Just like us.
People often find themselves regretting their actions, realising they have done awful things. What should they do in that situation?
They could decide that they've reached the point of no return, that there is no going back, no making up for it, that they have lost something elemental inside of their character that when taken away, cannot be regained. But this would lead to self-hatred and self-destruction.
Isn't it better for them to try to reform? For them to attempt to make a positive difference in the world?