Children born with birth defects or HIV did not have much choice, didn't they? What sin did the newborns commit?
You make as much sense as a hippopotamus explaining Shakespeare.
Newborns clearly have not sinned. They may suffer however do to the choices made outside of their control.
Children born with HIV are suffering because of the choices of the elder generation usually their father or mother. Human choices do harm the innocent.
Children with cancer are dying because a part of them has broken away and defected. It no longer acts in its assigned role for the greater good but instead strengths itself over the short run via unrestrained growth. Left unchecked that growth will eventually disrupt the delicate balance necessary for life and will end in death.
If you follow that regression of fault, you will end up at God, he who is responsible for everything.
According to your twisted logic, parents suffer having a baby with birth defects, not only by the choices they make or
don't make, but by the choices of their parents (as did the baby), and so on, all the way to God.
All your "blame the victim's parents" logic leads you to your main character.
Remind me who created and then punished Adam and Eve?
If you follow that regression of thought, you will end up with people, who are attempting to thwart the good God does, by not accepting Him.
So you see, it is the ungodly who are using their freedom to cause all the pain and trouble in the world, because the greatest evil is to be against God, if only by not acknowledging Him.