so one of the factors in father/daughter incest is the bias towards low status poor families
the father loses a job becomes depressed his wife stops caring for him or dies and sexually frustrated he either turns on his daughter or she tries to comfort him taking her mothers place and household responsibilities.
There's a bit more to it than that but that's the bare bones I can remember>>182383072
no that's apparently not how the shame and taboo works, the problem with incest and the reason it's such taboo is because it destroys the trust within a family and those that engage in it lead to ruin and become less successful or destroy their own family
the only real exception in in situations where the accrual or retention of intergenerational wealth is overruling the shame or actually seen as a virtue because said royal family might link the incest to gods and make the selves out to be different beings to the common folk and thus engage in rampant incest to maintain the "sacred blood" as well as the king's concubines