I just do not know where you stop digging for the historical origins of things sometimes.
The history of our species is not a pretty one. Our ancestors, even the relatively recent ones, were not peaceful, welcoming, and open-minded people. Go looking for it, and you can tear down just about anything.
There is eventually just nothing left that is not more-or-less from and created by the moral and ethical mores of the recent present. And even those are going to become outdated and retrograde in short order.
Loyal sons forever true
And we will fight that battle through.
And when we hit the line we'll hit it hard,
every yard for I-S-U!
What about the daughters...? What about those who are both or neither?