I and my wife were census takers a few years back. If a form was spoilt or incomplete, we had to go to speak to the person direct.This approach provided an opportunity for maximising the number of forms completed.
Much more difficult in a multicultural society where language could be an issue.
At the time I believed in the importance of a census to provide us with information to plan our future needs and services I.e Health needs, number of Schools, Housing etc. I have no belief in such today. Money drives planning not evidence.Despite available evidence from census. 'guestimate' is used to decide quantity. So why are we having to complete these forms other than to 'profile' the populace, possibly for 'Business'.Not paranoid. Just life experiences in Health and Education which have left me very cynical.