maybe the whole point of the movie was...
to see if we as viewers could forgive chris. yes, we saw Chris do a lot: he killed 3 people ( including the cop, which I am extremely disappointed about since he seemed like such a nice guy/had a kid on the way/ came into the bank to LOOK OUT for chris), and then he got off without any charges. so i think ultimately it kind of is up to us...do we turn a blind eye because of his disability or do we see his progress and deem him responsible for his actions?
just a thought.