Why are some 1950 census records not available
For instance, this link (https://www.familysearch.org/ark:/61903/1:1:6X16-9JT2) found in a search for a 1950 census record for a Mary Weir in Illinois leads me to a page which says
"We're unable to show this record to you.
This record can only be displayed on certain accounts. FamilySearch must honor the agreements we have with our partners, record owners, and internal policies."
I'm finding a a lot of these.