I see no evidence that great mathematicians or scientists or genre-defining artists or other admired abd beloved intellectual luminaries with enduring legacies or the recipients of the highest honors for any of those things skew narcissistic or with severe empathy deficits or any of that.
Brilliant people seem to be drawn from roughly the same ethical and moral distribution as the general public.
If you're not important to someone powerful, lying, cheating, stealing, and generally doing harm for personal profit will bring you to an unpleasant end right quick.
But the longer you can keep the con going, the bigger the bill: its an unserviceable debt. So Skilling and Meriwether were able to bring down whole companies, close offices across entire cities.
This is by no means the worst case though, because if your institutions fail to kick in? There's no ceiling, its like being short a stock in a squeeze.
You keep it going long enough, its your country, or your entire civilization.
You want the institutions to kick in before that.