[sneak]

> Parents have an obligation to care for children even when they didn’t choose to have children.

People who didn't choose to have children are not called parents.

> Conversely, children have an obligation to care for parents even though they didn’t choose to be born.

You've offered nothing to support this supposed (but not really) symmetry. This seems like back-rationalization of some cultural norm or tradition (especially when coupled with your anti-individualism swipes in the other comment).

Perhaps your beliefs are not as preordained as you may believe.