How do you know that these were due to runway incursions? There is a difference between a runway incursion and going around because another aircraft hasn’t cleared the runway in time. I have experienced only two go-arounds and both were due to other traffic having not cleared the runway in time – not because of aircraft entering the runway when asked not to.

The two in SFO were incursions as we were informed by the pilots…granted the one in Sydney was because a United 744 had left some rubber on the runway while landing just ahead of us