Personally, I repeat, personally, I love it when a vigilante kills. It's real. It's how vigilantism has always worked in history. Since somebody has hatred beyond self-preservation and wants a change. And I understand that anon hates that Batman's rule 1 is broken in the film, because the character is an ideal, a symbol, that conveys hope. Is a guardian. The protector.
And why isn't Ben Affleck a good Bruce Wayne? Charisma. Although there is an important point, from a realistic perspective, what do you think a person with the following problems would be like?
5. Extreme loneliness.
7. Suicidal fantasies.
Would it be charismatic? Would it be the Bruce Wayne of the golden age? Or in general the BW we all love and know?
No, I think we'd have something very close to Batfleck. And yes, I know a lot of people will say, "He's just a comic book character" but no, all means of artistic expression have a message to convey, something of reality to reflect to the people.
and in this case I believe this Batman has a point. But you don't see it at first glance.
I invite you to review the film but not to see it in its entirety, only the fragments that anon likes the most and maybe I'm not so wrong.