Reply To: Suffering Due to Previous Gilgul

“he is suffering for someone else.”

you are then left with the same question, how is it just that an innocent person is being tortured for the sins of someones else- which leaves us with my origin answer- “we cant know”.

“Jewish children being killed….turned out to worship an idol during the Krias Yam Suf.”

You just contradicted yourself. Now we can say according to this that whenever a Jewish boy dies its because look he would have sinned if he stayed alive. People who suffered along such as family members must also have sinned and deserve this punishment.