Korean scientist faked human cloning research

I heard about this on the news this morning and read the article hoping to find an answer to my real question which is: given that his work would be peer reviewed and attempts made to reduplicate it, why did he make the claims, surely he must have known that he'd be caught out eventually?
The only reason I can come up with might be that he believed so strongly in the methods he'd evolved and with a good and genuine result on the dog front, he perhaps thought that experimental reality would catch up with his hopes but didn't want to be beaten to the grail ...

The effect of such fraud is brought out by this quote.
"Alison Murdoch, the Newcastle University researcher who leads Britain's cloning efforts, has complained that Mr Hwang's fraudulent work diverted scientists from other approaches that might have produced crucial developments."

If I'm right in my guess about motivation, it's an interesting reflection on the non-scientific pressures on science and scientists. Science as an endeavour is not neutral and is much affected by the social and polical ends of the human individuals, groups and societies it is most intimately connected with. It's saving grace is that it insists on empirical, repeatable results. Which makes it all the stranger that someone would take the risks that this man has.
Guardian Unlimited | Special reports | Korean scientist faked human cloning research: