The existence of a Multiverse is perhaps real, for a whimsical chain of favorable circumstances leading to the emergence of intellect on Earth can only be explained in such a way.
If infinite space filled with eternal self-organizing matter is possible, then there arises a situation where there is an intelligent world that doesn't know its beginning, which is contradictory. Therefore, the primordial self-organizing matter is impossible. The such matter must have a beginning, and if there was other matter before it, it must have been without such property and also not infinite in space. At some point, this primitive matter accidentally acquired a property capable of giving birth to ultra-complex, whimsical phenomena over time. This moment can be considered the beginning of time, the origin of the universe and true being, and before it — the Era of Nothing.
The thought that the Multiverse is real relies on the fact that our Universe is too small to explain many mysterious phenomena, including the astonishing, favorable conditions for the birth of intelligence.
The origin of intelligence, is it a mandatory and 'inevitable' property of reality? No, it's causeless and spontaneous. Reality could have existed in a primitive form without the self-organizing property. So why does the Universe possess this property, thanks to which intelligence arose in the process of evolution? Just, without a cause. Without this property, no questioning being would have emerged.
The past and present events in the Universe point towards the fact that the extinction of humans, or any other potential intelligent life, in this space desert is a common physical phenomenon.
If evolution had a purpose, it would also need to possess a purposeful property to protect life from extinction and disappearance. However, mass extinctions in the history of life on Earth occurred, during which life could have disappeared, are a confirmed fact.
While Homo sapiens may not be saintly, they're pretty decent. We have what we have. Most importantly, there's a great chance to nurture and create a new kind of human — Homo humanus, the Humane Human.
Why does the world exist? The universe exists simply without a cause. It either emerged spontaneously or has eternally existed — that's a separate topic. Inherently, it possesses a self-organizing property but lacks a predetermined purpose. The universe is essentially a specific possibility for the birth and formation of various complex phenomena, including primitive intelligent life. Over time, these phenomena either get destroyed or cease to exist, while new ones may emerge. However, intelligent beings have the opportunity to extend their existence if they manage to harness the potential of their inherent qualities and the capabilities of their surrounding world. Fortunately, the potential of fundamental human traits and the opportunities offered by the physical world for flourishing are extraordinary, and it is our choice whether we reach the stars or regress into dissolution.