There is something about being surrounded by people who actually want you dead that makes you somewhat rigid about instituting measures intended to keep you alive. I'm not arguing rights and wrongs, here. Merely human psychology.

One thing that stood out to me when reading about the Rwandan genocide was that Madeleine Albright—who lost three grandparents to the Holocaust and was touted as being humanitarian in part as a result—was center of the US' diligent refusal to acknowledge the genocide they were watching unfold, and recasting of the Genocide Convention as merely allowing intervention in genocide. (It obligates intervention.)

Less than a year after the Holocaust Museum in DC opened its doors, proudly declaring "Never Again".

Funny enough, the Holocaust is the exact reason that these sorts of things are justified. It isn't out of malice, but out of a perceived need to protect themselves from the possibly of it EVER happening again. The collective trauma of being exiled from numerous European countries, the progroms in Russia and having ~6 million of your people systematically murdered in Germany overrides any guilt for infringing on intermarriage rights of people who aren't exactly your closest allies and continue to . I don't support the law, but it is important to understand the broader context in which it is passed and the purpose of the state of Israel to those that live there.

Almost all humans (and many other species) get tribal once allocation of limited resources comes into play.

Before the holocaust Jews were slowly but surely integrating into European society. The Nazis basically altered the timeline.

Israeli right-wingers don’t see Palestinians as a persecuted minority in a vacuum. They see them as members of the Arab ethnicity of the surrounding states which are much larger in size and population. In the late 1960s Syria and Egypt actually formed into one state and tried to annihilate and absorb Israel in a pincer movement. https://en.m.wikipedia.org/wiki/United_Arab_Republic