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.