I believe the argument "Laws/legal procedures are complicated because the world and its actors are complicated" is false because it confuses cause and effect. It's true the world is complex, uncomprehendingly so. But that bears no relationship to laws and policies, upon which man chooses to impose on his fellow man.

I do see how the application of simple law is complex. But that complexity could be seen as a trade-off. I'm willing to have a reasonable amount of injustice in exchange for simplifying the application of the law.