What do you mean “he doesn’t take responsibility”? He’s not saying that he shouldn’t have been to prison, he’s sharing an experience being tortured by the state while purging his prison sentence.
It's probably an issue of poorly chosen words, but compare
> fourteen months later I shot a man and unfortunately caused his death.
with
> fourteen months later, I shot and killed a man.
The way that it's currently written sounds like an accident: "I, a victim of PTSD, shot a man and, in a bizarre twist of events, he died from it". The passive voice there paints a disconnection between the cause and the effect.
Of course, judging a man's life from two sentences is nonsense. It just so happens that those two sentences are very unfortunate. But that's on the editor.