If the young grows on the riches collected upon the misery of others, they too shall suffer. Its universal.Thats a lie feed in to our mind. You do good or bad, ot doesnt matters. Have you heard anything about Yazidis(hope i spell it correctly ), they brutally suffered in hand of ISIS, you think that their forefathers had done bad things in past & current generations suffering because of that by his/her fore father? If yeas, then i will call god or kul dev or what ever as the most sadistic thing existing in this universe along with North korean premiere. Hear that in NK, if you did mistake like conspiring to flee in to another country, you will be put in to jail & your upcoming three to four generations Will be send to labour camps. I am damn sure that god is not be like that.
My point is clear, of you did a bad thing then only you are responsible for the deeds , not your younger generations.
Just because you don't know the whole history doesn't mean it's false. Its what makes everything balanced.