Humans are animals, and are the only ones who’ve evolved to prioritize big, expensive brains over every other survival characteristic. It took us a long time to do that, and even then, we spent a massive amount of time - most of it, in fact, running around not creating anything more complex than baskets. There is a lot of evidence - 2 billion years worth - that there are a huge number of variables that have to work out just right to produce something like what a human is.