The wisdom of Kabbalah studies the order of the cascading of the upper forces from the quality that is first revealed in Malchut of the world of infinity in four phases of direct light and then descends to us through Tzimtzum Aleph (first restriction).
Then Partzufim Galgalta, AB, SAG, MA, and BON are formed, then the worlds Atzilut, Beria, Yetzira, and Assiya, and then the special structure is created called Adam, or the common soul, and the shattering of this soul occurs. We are the pieces of this shattering.
As egoism manifests more and more in order to create the possibility of some kind of an ascent and work with it, the general egoistic mass breaks into more and more parts. Therefore, in our world we feel that we are multiplying—the population of the planet grows.
Conversely, if we enter into any negative relationship with each other, then destruction and wars begin, that is, a certain amount of the population is removed.
It is not because war kills people as we think it does, but because in this case humanity needs no large number of people, it therefore can be reduced. If there is suffering, fewer souls can also fulfill their purpose. This is the way to look at an increase or decrease in the population on Earth.
From KabTV’s “Fundamentals of Kabbalah,” 8/18/19