Did you aware the hacking of etherdelta system before you making an transaction?maybe all of us should know about this kind of problem in etherdelta site's thats why they temporary close there platform to repair there protection shield wall agains the hacking system and to minimize the victims of hacking wallet.but i thinks now  the etherdelta site is ready to trade again and back to its normal ways,while about attacking of general people mostly hackers did not define either you are professional or not  as long as  they can  get what they want  to us.