You presume too much.
Most of the cases involved were children born to American servicemen and their wives, when they were stationed in a jus soli European country or Korea post-war (the problem didn't exist in Occupied Japan).
You would deny citizenship to such children?
you’re confusing citizenship with being a natural born citizen
‘natural born citizen’ is a subset of ‘US citizen’
btw, you mentioned WW2. very few wives went overseas with their husbands in WW2. there were far more incidents of illegitimate kids being born to US servicemen and women of whatever country they were in.