Comment by perlgeek

You can see both from the videos and the photos that the sails weren't set, so I can't have been wind-powered at the time of the accident.

Operating a large, wind-powered vessel in a harbor or near shore is very tricky and dangerous (what if the wind suddenly doesn't provide enough propulsion to counteract some water current? what if it suddenly changes direction? breaking is also very tricky) which is why it's not done, and some auxiliary engine provides propulsion.