Widely reported in the press here.
Whale watching boat behind the yacht saw that the yacht was
harassing the whales, mother and calf. Got between them and mother took appropriate action.
As for the comment, "tourist boat being the boat problem" I can assure you that they would not even think about it. The regulations
for distances off are strictly adhered to by the tourist vessels and the penalties are punishing. The tourist boats often have a spotter plane up to find where the whales are and once spotted the all the boats close in. If one boat tries to get within the prescribed regulatory distance then I'm certain the others would be as quick as lightning
to "dob" them in, one less to compete with for quite some time if not forever.