Big-government advocates will say that as society grows more complex, laws must multiply to keep up. The opposite is true. It is precisely because society is unfathomably complex that laws must be kept simple. No legislature can possibly prescribe rules for the complex network of uncountable transactions and acts of cooperation that take place every day. Not only is the knowledge that would be required to make such a regulatory regime work unavailable to the planners, writes John Stossel, it doesn't actually exist.