The moral of the story is that even a stupid human being can be pretty smart. Particularly a sufficiently motivated stupid person.
That's an odd thing to say, since stupid is the antonym of smart. I think what you meant to say is:
The moral of the story is that even a foolish human being can be pretty smart. Particularly a sufficiently-motivated fool.
Foolishness is the opposite of wisdom, and the foolish/wise axis is roughly orthogonal to the stupid/smart axis.
Of course it also helps that intelligence comes in different flavors. Some people are good at spatial reasoning, others are good at verbal reasoning. But we often overlook social reasoning because it's not part of the traditional IQ tests. I think another reason that Social IQ testing hasn't caught on is that there is good reason to believe that social reasoning ability isn't fixed. Changes in attitude can strongly impair or enhance an individual's ability to process social information.
I don't think this has anything to do with social intelligence. It's perfectly possible to have high intelligence across every category, including social intelligence, and still be foolish. Wisdom/foolishness is in how you think about things more than in how your are able to think about things. Wise people consider the consequences of their actions carefully. I'm sure this guy was fully capable of thinking through what would happen if he got caught... he just didn't bother to do it.