Bruce knowing and deliberately ignoring that Selina killed Black Mask. ♥ ♥ ♥ Do you see, DC? When Bruce loves you, Batman lets you get away with murder. Bat-immunity I love youuuuu. :DDDDDDD
See also Dick Grayson more or less begging Batman for forgiveness after NOT saving Blockbusters life (Though it took him something like two years to admit it to him).
Even if it WAS Devin Grayson who wrote both the death and apoology scenes you can all but hear Bruce's "It's not your fault Dick, you were being badly written at the time" undertones as he explains it's not up to him to forgive Dick, it's for Dick to forgive himself.