Giving a list of a small number of people who bought a hat, limited by location and time

and

Giving full video footage of everyones wardrobes (!!)

Are equally unacceptable. Unacceptable, sure, that's a difference of opinion but full video footage of everyones wardrobes is not the same as a small list of names.

Perhaps a similar thing would be if there was a well-executed break-in somewhere, would it be reasonable to ask for a list of people who took out the plans to that building from the local planning office recently?

> When you're asking for "a list of all people who X" it's a fishing expedition not a targeted investigation of a few suspects.

By this logic, any CCTV footage should also be thrown out because it's "a list of all people who were in location X at time Y".