Sea Shepherd had accused the Japanese ship, the Shonan Maru 2, of deliberately ramming its boat, the Ady Gil. The Japanese vessel said the protest boat drove into its path on purpose.Look, I don't know who's at fault here. I wasn't there. But, that Japanese ship name made me think of the Kobayashi Maru so I'm linking this.
The report by Maritime New Zealand said that several incidents in days leading up to the collision had 'contributed to a tense operating environment and probable uncertainty over each other's intentions'.
Also, Japan, what did the whales ever do to you?! Why not focus on finishing off the great white sharks instead? Eat their fins or whatever you do.