AI art can literally be used to prevent image theft
Say I want to make a poster, and on it I want a picture of a Narwhal. But I can't really find a good picture of one I like except one decent one but the photographer prefers that nobody else uses it. So instead of taking that one, I just generate a new photo exactly how I want it.
This didn't hurt anyone. The AI may have been trained on these pics just to learn what a Narwhal is but ultimately it doesn't hurt anyone or ruin their day. Theft actually ruins people's day. If I stole that picture and the photographer saw it it could make them upset and make them come after me for damages or something.