Just because something IS there doesn't mean using it for an illegal action makes it anymore ok. Viruses are there to be spread, it doesn't mean it's ok for people to do so.
DCC was put there (as Khaled has also said) for trading pictures or wav files etc, not for the illegal way in which people use it nowadays.
People always abuse things and simply couldn't care less about how others feel about it.
Regards,
