Looks like the anchor sticking out on the bow did most of the damage like a battering ram. I'm not so sure the boston whaler was especially well built, it just hit head on. Triangles of any material are very strong, the triangular bow of the launch hit the flat side of the ferry and easily swept off the wheelhouse which was non-original, non-structural, lightweight and just tacked on top of the ferry.
If it had been the other way around then I'm sure the triangular bow of the ferry would have destroyed the flat side of launch quite effectively.
The lack of damage below the waterline