My birth was not an accident, while it was not my choice, it was the responsible choice of my parents, and theirs before them. Their decision was to maintain a standard of living that they enjoyed, and could not maintain by having a large family.
In another part of the world, the responsible thing for your parents might well have been to have as many children
as they physically could. In a poor country, a large family
is often the best way to ensure personal financial security
. Your parents were lucky to have been born into an affluent society after its demographic transition.
For you and I, the decision to not have children
(or a small family) is a selfish one. We enjoy a higher standard of living by doing so, so I'm reluctant to pat myself on the back for being a responsible citizen.
I sympathize with your argument that the third world has too many people. However, I don't think any single
person deserves credit on the back end for the circumstances of their birth. Every person alive today is just as deserving as every other person alive. This is, of course, a personal normative value, and one I can't defend with a positive argument. It's simply how I feel, take it as a data point.