Why is it fair that if a child born outside the USA does?

Because the US doesn't have domain over the entire planet and different countries have different laws that must also be respected. This is why any US person contemplating having a child in a foreign nation needs to understand the laws of that nation before proceeding. It isn't just developing nations that have some laws that might sound questionable to the US ear. Even our great ally Japan has custody laws that pretty much cut foreign fathers out completely. Other nations have laws that would cut a US mother out completely. 

Why would it NOT be fair to expect someone in the US to comply with US law?

Replace US with  the name of ANY country and ask the same question.

The law doesn't refer to ANYONE as a victim in you recycled hypothetical.

Because US law only applies in the US.

Yes, it's fair.  It's fair EVERY time you ask under every user name.  Same question, different day.  It's also the law.  Nothing has changed since your last series of questions.