We haven't seen preCrisis Earth Prime.
We don't know what happened
Earth Primes history is not identical to Earth Ones history.
Whatever justication the non paragon heroes had to stay out of freeland, vanished when the paragon heroes murdered the non Paragon heroes.
The Kryptonians need to stay out of human on human wars?
Adolf wouldn't have been an exception untill they found out about the concentration camps.
We don't know what happened
Earth Primes history is not identical to Earth Ones history.
Whatever justication the non paragon heroes had to stay out of freeland, vanished when the paragon heroes murdered the non Paragon heroes.
The Kryptonians need to stay out of human on human wars?
Adolf wouldn't have been an exception untill they found out about the concentration camps.