1. For beauty. Needless to say this.
2. In order to point out the topic. Only the death of the earl can clearly prove to the audience that the queen's going to sea is not only for the love of men and women, but a more lofty ideal-to get rid of the shackles of fate, love freedom and experience life.
So, you don't need to complain about the death of the ambassador, but look beyond love. This film is a bit deep. Especially in Garbo's performance, some of the passages are really good, like a desire from the soul, shouting-"Being a real person is more valuable than being a symbol." She has created a special image of a king, with entanglements and doubts under her wisdom, desire and impulse under her responsibility, and this image is full of vitality.
At the end, the king interpreted his will with a firm decision—abandon the crown and go to the world to be a real person. The death of the Spanish served this scene.
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