The tradeoff between kid 1 and kid 2 doesn't exist, because kid 2 doesn't exist. There is no kid 2 to whom to give life, any more than there is a kid 2 to whom to give a popsickle. To do good or ill by kid 2, kid 2 has first to exist; bringing kid 2 into existence is not a good for kid 2, nor is denying kid 2 existence a wrong, because kid 2 has no prior existence to grant hir good or ill. You can't harm an hypothesis.
The tradeoff between kid 1 and kid 2 doesn't exist, because kid 2 doesn't exist. There is no kid 2 to whom to give life, any more than there is a kid 2 to whom to give a popsickle. To do good or ill by kid 2, kid 2 has first to exist; bringing kid 2 into existence is not a good for kid 2, nor is denying kid 2 existence a wrong, because kid 2 has no prior existence to grant hir good or ill. You can't harm an hypothesis.