How does capote retell Perry's confession of the Clutter murders?

Perry thoroughly describes the night and all of features of the house on the night of the killings. It is all written in the present tense. Captors interrupts the story to add his opinion, and some extra facts, he helps the picture. Perry remembers the night very well, it is almost as if has scarred him. The story is told through various filters, which could mean that the story is not 100% correct. Dick is more ruthless and a more natural killer, Perry seems a lot calmer until something snaps. Dick got exited when he had control over them.  Herb 'couldn't' have suspected that him and his family were going to be killed, because then Herb would have fought for his wife and kids. When perry explains the killings, he says that he was a polite, nice person towards the Clutters. Perry makes the Clutters feel comfortable, before he killed them. Capote describes the killing of the Clutters, instead of Perry.