Because it is the nature of intelligent design to take matter and organize it.
How have you determined that "order" cannot exist without intelligent design?
I haven't. I would rather not speak absolutely when dealing with relative truth, which is essentially what science is all about. That is why I allow materialistic naturalism, evolutionism, etc. a say in public schools and wherever they care to speak. I would rather say cases of organized matter performing specific functions may reasonably be attributed to intelligent design and its results. It is not outside the realm of possibility that everything we know and observe in the scientific realm is a result of non-intelligent non-design.
So . . . I have "determined" nothing. And neither have you. We both have a faith. We both place our trust in certain things that have been communicated to us, whether by word or by other phenomena effecting our reason and senses.