Hello I am new here and really enjoy the intelligent and educated discussions here. I realise I have a lot of catching up to do in this discussion.
I do have a thought about those words. In another context, consider a driver who has accidentally knocked down and killed someone who dashed out in front of them. There are various possible reactions of the driver, one of which is: the driver may well think they have "murdered" the pedestrian and feel "evil", instead of being able to put the incident behind them. I say this to illustrate that some people are traumatised by accidents/incidents that are not their fault, but may well express guilt/despair. Such words are not necessarily indicative of confession or actual guilt.