.........but do you think a pilot who goes to work despite being unfit to do so will be forgiven during an incident investigation because they are not a commuter?
Agreed, but unfortunately many of us do go work not 100% fit and in a post incident investigation I'm sure this, and many, matters are considered.
If a crew member was domiciled at their base and was considered fit for duty, the investigation would most likely move on to other matters, (if not fit they would quite rightly have a case to answer).
If, on the other hand, it turned out that the crew member had commuted several hours from the other side of the country then waited around the terminal to operate out, the investigation may very well dwell upon this.