There is a vast difference between deleting messages, an action that can be reversed (only within that session if the Deleted Messages folder is not persistent), and deleting 10s, 100s, or 1000s of messages in one go by deleting a message Folder. As deleting a Folder is not a recoverable event. I'm sure Mr. Harris' intent is to protect users from themselves.
There is a vast difference between deleting messages, an action that can be reversed (only within that session if the Deleted Messages folder is not persistent), and deleting 10s, 100s, or 1000s of messages in one go by deleting a message Folder. As deleting a Folder is not a recoverable event. I'm sure Mr. Harris' intent is to protect users from themselves.