Import logs can be deleted by creating a bulk delete job as described in the docs below.

Free up storage space - Power Platform | Microsoft Learn

However, there are logs that can only be deleted by deleting them from the import UI.

Import data (Dynamics 365 Marketing) | Microsoft Learn

Users with tight log usage must have the ability to delete this record in bulk.

If there are a large number of records that the user wants to delete in bulk, it takes a huge amount of man-hours for the user to delete the records displayed on the UI every page.