Except, as I said, it implies that he was transformed by outside events and not actually a bad person to begin with. If they wanted to make that arc more convincing, it needed to have the rape played normally, or taken out. Glen Mazzara is playing the Walking Dead as standard television, and that's one of the biggest problems. It's too far adapted to TV.
Showrunners shouldn't stick to what they always do, they should be more focused on bringing the moments of the comic to life. To me those are Carl shooting [human] Shane, Tyreese in the prison (which still could happen), "We are the walking dead!", Lori's death, and Glenn meeting Lucille. So far, they haven't got a single PANEL right.