Answer: They are parts of your soul. There is nothing unnecessary in creation. You must attain the whole of your soul, which is the unity of all private souls at all times and in all states. By combining them in yourself, you will become like Adam in relation to the Creator.
But do not think that you have to wait for other souls to correct themselves. It is you who must correct them in yourself.
From the Kabbalah Lesson in Russian 3/4/18