Why is deleting files from your "Recently deleted" Folder so unforgiving?

For a couple of years I am working on my "heritage" and have gathered lots of information about dead people and living people as well. At home I used a MacPro for that, because most of the data are on line, but, because the -so called - genealogy libraries are not in my direct neighbourhood I use my iPad occasionally when I visit one of those libraries. This is an iPad Air M2. A few days ago I wanted to delete the files which in the mean time had been gathered by the iPad in the Recents folder, because these files can contain very private information. And I don't want them to be accessible to anyone. Deleted files are still accessible in the "Recently deleted" folder and you could delete them from there as well. But doing so deletes this file from any other location, that is disc, folder, iCloud etc. So the original file is lost. Why is meant this way? And is there a way to bypass Recents so these "critical files" are not mentioned in this folder.

As always: Thanks for your time, guys

Hans