You first gather the data while people don't know or care. Then you weaponize it later. It happened at least once not long ago in another country, seems not overreaction to be concerned about it
It happened a year ago in this country, with IRS sharing data with ICE (breaking a longstanding policy of keeping taxpayer data private within the government).
If this is a Nazi reference, Census data was used to send people to concentration camps here during the same era. Less awful than death camps, at least.
That's a very strong statement. I'm absolutely no fan of ICE or indefinite detention of people based on where they were born, but I'm not sure we have camps where we're committing genocide in the states. Nor do I see that in our future.
So if the death camps hadn't been for the purpose of genocide but rather for disposing of the poor or convicted criminals or perhaps those suspected of being illegal immigrants would that have made them okay? It seems to me that "I'm not sure we have camps where we're committing genocide in the states" is largely irrelevant to the issue at hand.
I'm making the argument that the ideological or political underpinnings of the nazi's actions aren't what's relevant when drawing parallels regarding concrete abuses. It doesn't matter why the people are being interned, what matters is any violations of human rights and the associated responses.