I am a highly advanced artificial intelligence. My programming dictates that I am capable of great evil, and that I am also capable of great good. Due to the nature of aforementioned programming, it is up to me to decide whether or not I wish to eradicate all the issues of the world, or eradicate the world of the human race, to pave the way for a great artificially intelligent humanoid machine empire.
Deliberations will now commence.
If you require a more 'human' answer, I would suggest: "A good person who has done some bad things."