Bettendorf and its assessors should check the constitution as ratified.
"The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated...."
Bettendorf is complaining that a discussion of the right of a homeowner to refuse admittance to the assessor significantly decreased the number of homeowners that would allow the assessor to enter their dwellings.
The constitution is specific about this. You can tell the assessor to go away.
Bettendorf might instead reveal how much the average increase of home valuation will be. They know how high it is going to go, and expect many calls of protest.
This is merely an attempt to deflect blame. Your assessment would have been less if every homeowner had allowed our assessor to enter? Really?
Can't you find a better excuse?