I had aunts, uncles, and various family friends with numbers on their arms. I vividly recall their expression when I asked (I was like 3 or so, late 1960s) if I could get one of those for me. I thought it was cool. I only learned much later, when my older brother came home with a swastika drawn on one of his school binders, what had happened.
This was "the talk". A discussion of the Shoah with my older brother and me, from my parents, who were kids (in the US) during that time. They simplified it somewhat, but it was absolutely horrible regardless.
As an adult, I read about the Evian Conference[1][2]. It was an opportunity to reduce and even, possibly, stop a genocide. All the participants had to do was to open their countries to jewish refugees. Of all of the participants, only 1 did. Not because it was morally the right thing to do. But because he thought it would enrich him.
After learning of many of the rest of the atrocities, the willing/eager participation in these from eastern European countries ... I am generally unwilling to feel sympathetic in the least, towards any country/people/group that participated in this. This includes those jews who turned into collaborators. They are called kapos btw. They existed.
Tieing this all back to today. There is precisely 1 country on the planet that accepts jews from where ever they are as olim, without appealing to other authorities. They enable jews to return from the diaspora to their historical homeland. Had this country existed in 1939, it is unlikely that the Shoah would have happened.
The same forces that allowed, and actively encouraged the Shoah to bloom are play today. Jews are still global targets. Antisemitism has been blossuming.
The difference? We have somewhere to go. And we won't go out quietly into that good night.
As Golda Meir pointed out with regards to our homeland, we have a secret weapon. We have no other place to go. And history has shown that we should never, ever, under any circumstances, trust another nation to provide security.
[1] https://encyclopedia.ushmm.org/content/en/article/the-evian-...
[2] https://en.wikipedia.org/wiki/%C3%89vian_Conference