This is getting even more fantastical by the moment.
I’m also pointing out not-that distant past events, and you’re also just completely ignoring them.
Good luck! Just don’t do it in my economy.
Look into the efforts of individuals within Nazi controlled territory during the war to save Jews and other persecuted people. When the SS comes knocking, if you’re a good person, you have a chance of “losing” some records before you hand them over. If it’s all in one government controlled database then there is no chance for individuals to work against the system. Hey, I think they even made some movies and books about this stuff.
In your hypothetical scenario of nazis taking the gov, lets assume there is no central database. Nazis would go: ok banks give me your databases or else. Banks gives databases because they care about money. There, now nazi have central database. And in this scenario you have deprived the people of enjoy a really nice service.
Where is the win here I don't see it. Let's not do good thing because, oh, in a doomsday scenario good thing might be bad. Like, shouldn't we channel efforts in ensuring doomsday never comes to reality in the first place? This way we all enjoy good life with ever improving services.