“The Course Of Empire” is a beautiful piece of art for many reasons: it’s clearly masterful, it represents complex ideas simply, it conveys emotions we lack words to convey, it beautifully displays the human experience, and so on. It’s art even if you didn’t have a human to experience it - it’s self evident.
Taping a banana to a wall isn’t art. A silent song isn’t art. These are just childish, amateurish displays only enjoyed by a nihilistic culture devoid of meaning. If what you make only counts as art because it “starts a conversation” about how stupid and garbage and insulting it is, then it’s not art at all.