incest: the interpretation
Pandora's question is valid in that it points out how the practice of incest is condoned (scripturally even!) in some situations, but taboo in others.
There are of course different responses to the word "incest", dependent of course on what the word means to the individual.
It can indicate a means of reproduction, usually a result of a desperate attempt to maintain a "bloodline" or family name. The bible has more than several situations that fall into this seemingly - innocuous category.
Or it can signify a horrifying abuse of power where an adult who is a sick fuck forces someone over whom they have immense influence and power to do something that results in hideous psychological damage to the abused.
It is not surprising that a reasoning person will question the context of the term. Having endured enough talks glorifying Lot and his escapades and how they furthered "kingdom interests" and having to accommodate the fact that incest was integral to the interaction, and having that whole incest concept be dismissed as "whatever", as my guts filled up with balloons of fear and confusion and I exerted myself strenuously to remain seated in the little rows of cramped chairs among people who consciously extended respect and gratitude to this historic man who not only got "drunk" and seemingly allowed himself to get seduced by his daughters (EXCUSE ME, BUT I HAVE NOTED IN MY NOT SO SHORT LIFE THAN DRUNK MEN ARE NOT REALLY CAPABLE OF HAVING "SUCCESSFUL" SEXUAL RELATIONS, and going into the sordid possibilities of someone being so pathetically drunk that they don't even notice the fact that the person trying to seduce them is their own daughter(s) is something I'd rather not go into right now, if ever...) so that finally, Jesus could get born; and yes, this is a little fragment of history captured for our benefit so as to illustrate how Jehovah's divine plan was carried out.....
Again, the end result for the unthinking masses: Don't think about this. Take our spin on it. Nothing bad ever happens, and if it does, just pray more and attend all of your meetings and enmesh yourself with our lifestyle, pretend that it is not devoid of meaning, and YOU TOO CAN BE DRUNK LIKE LOT, and maybe you will be the mother of Jesus, someday.
It's only water from a stranger's tear (Peter Gabriel)