Why?
Power was out, lowering a big ship’s anchor is not simple.
I’ve read the back anchor was dropped shortly before hitting the bridge support column.
I’ve seen the videos. Some are excellent quality. For some reason they were not going under the bridge in the center (taller and wider) space between columns. It looked like they were trying to move toward the other side of the column where it was taller and wider.
When they lost power they lost rudder control? I don’t know.