I am aware that anything could have happen, but this is what did happen. I believe that this happened for a reason beyond just one of the possible outcomes.
Something that might clear up your question is the Anthropic Principle.
Essentially it states that we can only ever comment on how suited the universe is to our existence because we exist. If it weren't, then we wouldn't even be asking the question.
Imagine you had a sophisticated 3D printer, which produced completely random items. The odds of it creating a working camera when you activate it are small, but they are non-zero. Every time your printer makes something, you try to insert a memory card in it and take a picture in a mirror. You then proceed to print and test an arbitrarily large amount of items.
Imagine then that later, someone goes through the memory card that you used to take the pictures. All they see are photos of you taking a picture in a mirror with a camera. It would be wrong for them to assume that because the only pictures they can see are of the intact and working camera that the 3D printer was only capable of creating cameras.