A debt we "owe" to anyone else, expired before the ink dried.
This is beyond the playground "my daddy can beat up your daddy".
We've progressed to grandfathers (and earlier).
The sad thing is, this is EXACTLY the behaviour that is causing problems in the rest of the world. Tribal warfare that has been going on for generations.
Those without any accomplishments of their own, can still find solace in hating the "enemies" of their "people".