The story is being told from the perspective of Jefferson Peirce and the ending is a direct rebuttal to how he thought at various times during the book. It's meant to be a different point of view, not necessarily the correct one.
John Stewart didn't try to kill himself again and again, but that's the gossip that Jefferson heard third-hand. Superman didn't avoid Suicide Slum because he doesn't care about poor neighborhoods, his efforts as Superman were symied by the 100's magic so he had to help them as Clark Kent instead, but our point of view character wouldn't know any of that, just as Batman didn't realize he only knew one black guy.
I look forward to Bumblebee's point of view.