After all, if Adam & Eve hadn't sinned, the unique combination of ancestors that led up to your existence would never have occurred.
i.e., if you're going to go the "Genesis is literally true in all its details" route, you should be supremely grateful for Adam's sin, because without it, you wouldn't be here to ponder the question.
Just to show how far you could take these arguments: wouldn't a God of justice bring "to life" in the New Systemâ„¢ all of the perfect offspring they would have had, but didn't have? Seems a little unfair that those perfect-innocent-children-that-never-were would miss out on ever existing.