I suggest to add to Delete Folder task the following functionality: if the folder is read-only (contains at least one read-only file) then skip its deletion and move to the other folders in the directory.
It can be activated through the appropriate checkbox.
Currently when Delete Folder task encounters read-only folder it breaks without processing other folders.

Similar logic can be also used to enhance Delete File task.

This functionality would be advantageous in the situations when there are folders which should be deleted by data retention criteria, but we want to temporarily keep them, because some processing have yet to be done.