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Now, since the census worker thing has been brought up, it appears that the census is hazardous business both for census workers and also for compliant citizens.
The point is, it's easy pickins for criminals to pose as a census worker in order to gain entry into your home, and it also the opinion of many that the census' attempts to collect information amounts to an infringement of an individual's right to privacy. In any event, there is little reason to allow a census worker to enter one's residence. A legitimate, non-criminal census worker with no malevolent intent should tread lightly and rapidly comply with a citizen's demands for them to depart the property if only to preserve their own safety. If one presenting themselves as a census worker does not immediately depart when asked to leave, there is a fair chance that the homeowner is going to consider that they may not be who they say they are and proceed to utilize force to remove them from the property.
To reduce the risk of hijacking this thread, I should point out that
anybody who enters private property for any reason, and then declines to immediately leave when they are told to do so by the owner of the property is putting themselves at great risk of bodily harm. We have home invaders, craigslist posers, fake census workers and all kinds of other dangerous people to thank for this. Belligerence is risky business when one is trespassing.