Thanks for the tip. Since you banned me from there, this is not a "core religious principle" at all, this is just a rando rabbi who recognizes that Rebecca was strong enough to water many camels and mature enough to give informed consent to an arranged marriage (see the text), but who also believes the strand of tradition that says she was three (other Jewish traditions say 13 or older) and doesn't want to abandon that. Note that it would be understood by all the original audience in Near East culture that arranged marriage is only a betrothal, to be consummated sometime after maturity. The rabbi also acknowledges, without elaboration, that the standards are different today.

We cannot infer that everyone who talks about the history of arranged marriage (including me, when I try to be objective about the past) automatically is promoting pedophilia. If there were a pointer to something creepy going on that would distinguish this case from the ordinary historian trying to speak objectively about marital customs (like Westermarck), that would be different. The account framing says "tries to justify ... sex with a 3 year old girl", but every historian knows that's a false framing. In fact, since there was a tradition that barrenness should not be judged until the 10-year mark, and Isaac wasn't concerned about barrenness until the 20-year mark, that is taken as evidence that he had no relations with her for 10 years (and may inform the 3-year-old tradition too). So if there's anything creepy it's the person who posted it and misinterpreted it prematurely. The person who jumps to pedophilia whenever any old Near East arranged marriage is being discussed objectively poisons the well to forestall us from punishing real pedophiles who abuse and kill their victims.

Also there is no list of 109 countries and no objective methodology on how many expulsions there were; when objective methodology is used, there are only 12 modern countries, regions of 10 others, and a handful of other regions that vary by count but don't reach 109; and the expulsions overall become similar to those of Christians, Roma, and Muslims.