Okay, and so...what? Pointing out that the belief concerning women turned out to be flawed does not implicate another, different belief with the same origin.
It points out thinking that we've decided was problematic was involved. It's not a case in itself, but it is indicative of the fact that this is both normative and that there might be some issues behind that normative thought.
They have to be found flawed for their own reasons.
It wasn't meant to be a case in point. It's meant to make people think about the origins of the things they think, and understand that these ideas don't float around in the aether.
I wasn't making a historical argument
Which is the problem. You weren't making a historical argument to explain a historical development. The reason that behavoir around hitting women changed is historical and requires a historical argument. The rationale you gave was simply not the operative one here even if it makes sense now.
Because at the end of the day the reason we don't hit women now is because we've normalized the idea that it isn't okay, not because people who would otherwise beat their wives sit down and think rationally about the meaning of their actions.
I also haven't actually justified anything in this thread (except to not hit your kids); I was pointing out why the proposed comparison is unjustified.
No, you justified the principle that women should not be hit. I agree that they shouldn't and I even think your logic is good. But it's a post hoc justification for why behavior changed. That's not why it changed, and that at best only plays a small part in why we currently don't see it as acceptable.
And what I was saying was more: the utility argument is enough to overwhelm any ethical argument. If it can be proven (which in my mind, it has) that hitting children has enormous negative effects, then it quite literally does not matter whether parents have the moral right to do so.
I mean they work on different levels. Sure it could do that, but it evidently isn't. Again the purpose of what I with that post wasn't to make a full rational case for why you shouldn't hit your children. It was to make people think about why they believe what they believe, and how that is connected to other historical developments.