If the Jews are the chosen nation of G-d, soon after how could He allow the holocaust to happen to them?

We cannot know why G-d would allow the Holocaust to occur. However, we do know that the Torah predicts events such as the Holocaust whether the Jewish humans remain in exile. The Torah tells us that whether the Jewish society choose to sin while living in Israel, it will start a lengthy series of events that will start with suffering in the land, followed by exile, followed by severe persecution. These events will ultimately lead the Jewish citizens to

realize that their intense suffering could only be explained as G-d goading us to understand that we cannot survive without His favor. That realization will lead to our redemption. (All of that is clearly explained in Deuteronomy, particularly the portion of Haazinu (Deuteronomy Chapter 32).)

In other words, being G-d’s chosen humans does not just mean that we are privileged; it means we have the responsibility to shoulder His mission for the world. That is an immense privilege, but it plus has tremendous risks.

May we enter the day of redemption soon.

Original post by ATR