Not sure exactly what Bullet Proof Security's supposed to do, but deleting the public_html/www folders normally isn't something a plugin can do. In any case, I'm working on re-creating them; if it should happen again you can do so yourself through cPanel, just make sure to set the permissions to 750 after creating it to ensure proper operation.
Edit: as a side note, because the folder was erased, so was its contents; you'll need to reupload Wordpress and any plugins you were using and re-configure them.