Deleting revisions doesn't delete the changed content

Deleting revisions only removes the version in the history but the modified content is not only not removed but it is associated to the author or the next revision, implying that the change was done by that author.

Use case example: Someone brings some wrong changes to a document (like some spam content for ex). Then someone else doesn't notice these changes and make changes to other parts of the document and saves. Removing the revision from the 1st author makes its changes associated to the next author... (who becomes the spammer in case of spam).

Note that removing the last revision is the only case where deleting it removes the content (since it acts as a rollback to the previous revision).