Recurring theme in post is " doesn`t make sense ". If you think within the box well, of course it does not. Most accidents do not make sense, even after all have been explained.
What makes sense here is that the planned landing was not executed, the attempt to level off in the go around could not have been planned. That is when all went wrong, because it was not planned. It could only have been an instant, unpremeditated, spontaneous response to an unexpected event or encounter. Energy management essential in such circumstances must have been precluded by other more pressing priorities.