But when you take someone else's content, be it a book, a TV broadcast or a web site design, copy it either completely or substantially, and then proceed to personally profit from that work without the permission of the creator, you've crossed the line. Granted the distinction between copying (bad) and imitation (flattery?) can be fuzzy, but in this case it seems very clear.
If we simply say that with regards to information, no laws except the laws of nature are necessary, then some lawyers will lose their jobs, but there will be less friction and eddy currents in the system. Overall our endeavors will be more productive and quality of life will generally improve.