Hm, I'm not sure. Sorry.
No need to apologize. JoshuaZ pointed out elsewhere in this thread that it may not actually matter whether the original goal remains intact, but that any new goals that arise may cause a similar optimization driven catastrophe, including reward optimization.
Part 1 was previously posted and it seemed that people likd it, so I figured that I should post part 2 - http://waitbutwhy.com/2015/01/artificial-intelligence-revolution-2.html