We now live in a world where the machines needed to copy things are commonly owned by individuals. Copyright, having been designed to regulate industry, is massively out of date -- individuals do not have the resources needed to decide if they are abiding by copyright. Even the entertainment companies that cry about the importance of copyrights know this, which is why they keep pushing for DRM. No sane person actually believes that normal people are going to stop and think about whether or not they are obeying copyright laws; that is just not how people generally behave.
The truth is, in the 21st century copyright is nothing more than a red flag law that exists solely to protect obsolete industries.