I'll never get tired of writing this:
"complex universe" is not a law. If you think it is, please link to a peer reviewed paper which asserts that there is a law called the "complex universe law".
Call our complex universe what you will or what you will not. But the fact is that the complexity of our universe is a fact.
What this means is, if science somehow fails to recognize cause and effect as a law of science, then science is simply remiss in this area.