Because this Area is hidden and secondly if you click this you will see the files that are in your recycle Bin not the original file.
As this area is hidden so you cant see it and the file, if your computer is infected with such type of malwares.

Defend this Technique:-

Is of all your lets imagine the virus is in your pendrive with an autorun.inf file but haven’t infected your PC yet. To see this you should have a powerful explorer instead of windows Explorer. I recommend WinRar Explorer. It’s basically not a explorer but it’s a compression tools but i think it’s explorer is very very powerful. With the help of this your can discover these type of malwares and can easily delete them