I see it as enabling people to make images in a style they admire and would like to draw but don't personally have the skill. To me the concept of copyright is the only difference between AI art generators and say, springy leg braces that let you slam dunk like Kareem Abdul Jabbar. I understand there are business ramifications some people might object to, but I don't get the moralistic part of the outrage. Maybe somebody can help me understand by explaining it rationally without screaming or calling me names, but spitting rage at me is pointless.
edit: from the abundance of downvotes and lack of explanation I take it people know they're supposed to be outraged but don't know why. The telltale mark of meme culture, wear it proudly!