Because this sort of thing is not an intended use case for copyright? You may as well say crowbars are incompatible with free speech because I could hit somebod

Because this sort of thing is not an intended use case for copyright? You may as well say crowbars are incompatible with free speech because I could hit somebody with one to get him to stop talking. Copyright isn't meant to cover ideas, so it couldn't, in a hypothetical well-functioning system, be used to restrict free speech in a meaningful way.