Here’s the case, put relatively well:
Moral superiority aside, a somewhat general rule of thumb is that if you have children AND they live in the same country, then you have a HIGHER vested interest in the wellbeing of your country.
I’ll take “wellbeing of your country” to mean wellbeing of the residents of your country, though it doesn’t have to mean that.
Now, this argument is one that’s true sometimes. But only sometimes. It also assumes that parents care about the wellbeing of their children, which isn’t always true, but we’ll assume it is for now.

