I didn't assume. Hence the question mark. So, if it's not true that someone is hurt by every movie download, then why are the movie downloads, where no one is

I didn't assume. Hence the question mark. So, if it's not true that someone is hurt by every movie download, then why are the movie downloads, where no one is hurt, ethically wrong? Why is "it's not hurting anyone" a bad ethical argument in the cases where it's factually accurate?