Why is my ~/Library/Safari/Bookmarks.plist "damaged"?
Mine bookmarks preview looks the same as yours; in finder or from terminal you do not have the rights to do something with. However, with Safari | Bookmarks | Edit Bookmarks you can do anything you need with it - deleting an item, renaming, modifying the address. If you need to export it, you can do it from File | Export Bookmarks... - and will be exported as .html (while you are in Edit page).