The negative effects of acid rain on regeneration are still mostly unproven theory and that type of theory attracts the same kind of ecoweenies that the global warming hoax does
Your reasoning is flawed because the ecoweenies are not blaming acid rain for the lack of regeneration, they are blaming the deer. While it is true that the effects of acid rain on oak have not been proven, it has been documented to effect the health of mature oak and sugar maple and as yet they don't know what effect that may have on seed production or viability.