Zonoma
We cannot have it both ways
One minute the argument is that this is all about the Captains superior judgement but a landing clearance with an aircraft still departing is ATC?
Surely a landing clearance with an aircraft rolling would mean the superior pilot would be on alert for the fact that something could disrupt that takeoff so he would still be in the go around mental mode.
Most situations are more likely to be a warning of a late landing clearance
At V1 there is a 99% chance the aircraft will takeoff regardless of a major problem so while the aircraft may still be on the runway it is committed to fly and travelling away from the direction of the landing aircraft. Aborting after V1 would probably mean the aircraft would have cleared the runway involuntarily
Loss of directional control? it unlikely to end up on the runway. So both situations the aircraft would have gone off the end or into the fields.
I do not think the same attitude is there for aircraft which have landed and not yet cleared as that aircraft is relatively static and may not clear creating a high collision risk.