No, they effect everyone. By publishing the mod, the creator told the world exactly how they feel about this subject. If it were the case as you put it, then they’d just create the mod and use it solely for themselves and not tell anyone. It’s still despicable, but at least they aren’t going to hurt anyone as no-one can stumble across it. Instead, they made a choice and the backlash they’ve received is a consequence of that choice.