OK, let's raise a few points (full of simplifications, but I hope you get the gist of it):
Art is as old as humanity itself and the creation of art has been something that most people would engage in. Much later the idea of a professional artist came about. Over time the trend has been more and more to have to classes of people - the artists who produce art and the common folk who consume it.
Rich patrons paid for the creation of art by professional artists, but they were not the only consumers. Common folk could go to theatres or live music performances.
Art was democratised by technology, not by copyright laws. Copyright was created to place limits on what could be done to make sure that artists will benefit (for a limited period) from the work they created before it became part of the public domain.
For the largest part of the 20th century the technology was as such a stage that you needed large amount of resources to mass produce copies of art. This gave large corporations the same kind of monopoly on the creation of art that rich patrons had in an earlier era. They profited hugely from the state of technology and from copyright laws that were originally intended to foster innovation, protect individual artists and benefit society as a whole.
There are many problems with the way big corporations abuse copyright, but one of the worst is the way that they keep on pushing for copyright extension. They want to take from society and give nothing back. Take Disney for example. If you go through their products you will find hundreds examples of them profiting from the public domain (Snow White, Cinderella, the Three Little Pigs, Treasure Island .. you can fill pages with this). Yet they will do everything in their power to make copyrights perpetual. Mickey Mouse is now more than a hundred years old and yet they still retain exclusive rights. It does not benefit the original artists and it stifles innovation - the exact opposite of what copyright law was intended to do. If you have a child in kindergarten, they can't put up a play with Disney characters in them without infringing on their copyright.
In the mean time technology has progressed to a point where the stranglehold that large media conglomerates have on art are no longer the natural state of affairs, but they will fight tooth and claw to keep their racket going.
Technology has moved on, but our laws are still largely from the 18th century except that they have over time been skewed in favour of corporation and against the rights of artists and society as a whole.
Laws need to catch up.