[Son of Sephiroth]

basically it's because EVERYTHING in the universe follows laws. EVERYTHING. NO EXCEPTIONS. If you had enough time and a long enough piece of paper you could write out the laws of physics in equations or words or even computer code (OMG MATRIX THERE IS NO SPOON) and humans in their infinite egotistical stupidity think they can defy these laws? they can do as they plase? No they can't they follow these laws. They are a make up of biological functions designed purely to forever replicate itself. The unfortunate consequence of a concioussness and a sentience is a biproduct of the genome obeying these rules. This sentience we have is still motivated by the biological laws and we are forever trapped inside them.