thinking about how John’s continued downfall after tfatws wasn’t so much caused by guilt as by suppressed grief for Lemar.
i mean, when he had his breakdown, he shut down his emotions himself with "time to go to work". then he was attacked to take the shield. when the government fired John, they weren’t interested in the context.
no one cared that Lemar - his friend, his brother - was unjustly killed.
even with Lemar's parents, John couldn't be honest. not because he wanted to be a hero in their eyes who had avenged their son, but because he wanted to give them peace.
I can’t imagine how awful John felt when he realized that not only had he failed to protect Lemar, who had sacrificed himself for him, but that he couldn’t even avenge him. he knows he made the right decision when he chose to save the senators who fired him, but that doesn’t mean it didn’t hurt like hell, doesn’t feel like he’s a betrayer.
and considering John’s mental state and his defense mechanisms dialed up to the max… he really didn’t stand a chance of truly processing his grief for Lemar.
eventually, he plunged into his work, running away from reality and not noticing that he was leaving behind not only ghosts but also the living ones, his family.