Why did god allow people to be born after the fall ?

[John V]

That is simply bullshit. People do this all the time, and many christians will admit to it.

You need to look up the word entail.

Exactly what I was thinking.

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How can it be god's will that not all perish and come to knowledge of truth, but at the same time knowingly create a world where his will cannot come into being.

This question has been answered multiple times. CL put it very succinctly:

As to your question, as I said: I would assume because He saw that ultimately the existence of humans would be a net good.

Your refusal to acknowledge and/or inability to understand the answers that have been given doesn't make the question unanswerable.