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> Replying to the ACS with accurate information is required by law, so they don't actually need to rely on people feeling safe to get answers.

This works by the same principle as how nobody ever drives faster than the speed limit.

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I don't understand your point here. Are you saying compliance isn't enforced?

As someone who got an ACS survey not long ago and had no interest in completing it, it certainly appears to be.

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There's not many cases of enforcement. Non-response is taken about as seriously as the Robinson–Patman act. I think the Census Bureau is very reliant on people thinking there will be enforcement, however, which is why the materials they send all have a threatening aura. I don't know about the ACS, but for the decennial census I often felt like my job as an enumerator was just to bother people until they'd answer. The case would keep being recycled until we got at least (IIRC) a head count.
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They can certainly enforce that you answer the survey. But it's very difficult to enforce a requirement that people answer questions accurately, particularly when they perceive that doing so will expose them to danger.
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I don't get what danger is being referenced here that exists only if the data is released to the public (in aggregate)?

The government is the primary and arguably only source of the danger, and they already have most of the data whether you answer the ACS correctly or not.

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