My God, the fans with their 15 year old sensibilities have finally come true in Zack Snyder. All their wishes of making Batman more hardcore and violent and dark and gritty are in this film. Those niche fanboys in the corners of the internet are fulfilled. Some of these fans feel like it makes themselves feel more validated and grown up, some don't of course, but I think if Batman outright murdered, oh, excuse me, committed man slaughter more, it still would be justified. Just like if Snyder made Superman let a little girl die or killed one that would be justified too. It never ends. That's the thing: There is no line drawn which is the problem. I just never thought Snyder would make Batman a murderer. There are no rules for Snyder's heroes, hence people not making distinctions for these characters values, so it leaves them free to give their own dark justifications.
This interpretation is on the opposite end of spectrum for Schumacher's Batman. His was too stupid, this is too dark and cartoonishly so, but this is worse because you can't even laugh at this.