The existence of miscarriages, cot death and childhood leukaemia do not point to a fair god.
The concept of appointing collective guilt or innocence is very religious. The bible, for instance, says that god will punish those not even born yet.
Your deal seems positively Faustian.
Well then, if there is a punishment, then I suppose you'll get yours as well and you are just fine with that. So seeing someone else get punished is important enough for you, that you would even willing to be punished yourself just to see someone else get punished. Oh well, that's your choice. It wouldn't be mine.