YouTube - Ady Gil Rammed (Synched PiP)
This video is clearly on the side of the anti-whaling side, but I cannot help bit notice that the Ady Gil revved its motors seconds before impact with the Japanese ship...an action that put it into the path of of the Japanese boat. Look at the top video right before impact. That is not clear from the bottom video.
EDIT: Actually, it is. Looking at the top video, and then the bottom video, the Ady Gil clearly was not at a full stop, and put themselves in the path of the Japanese ship, and therefore was struck.
I am not a boating expert, but a small speed boat should be more maneuverable than a much larger fishing boat...so why would they rev their motors into the path of the larger boat? And on the original video by the OP why are the videographers of the incident laughing?