First, how do you account for all the art made before copyright existed. Second, what about all the art created everyday where the creator does not pursue copyright let alone try to enforce their rights in a court of law. These two scenarios disprove your assertion that art needs copyright.
Perhaps you are under the misconception that artists need to make a living. Art is an expression of our culture and it is not inherently tied to making money. How many people are creating art right now without the intention to sell it. I will clue you in, there is a lot of people, millions who do this everyday.
The amount of art created for personal use dwarfs that of commercial use by a thousand fold. Copyright does not need to protect these artists at all. Read that, the majority of artists do not need or ever use copyright.
All art is iterative. This means every piece of art is built upon the art that came before it. Copying is literally how it is done. You know Led Zeppelin just copied a bunch of old blues songs? Oh you didn't because you think artists create stuff out of thin air apparently.
Stealing is depriving someone of their property. Copying does not do this at all. You are pushing a false narrative to prop up your flawed argument. Plain and simple.