When the government doesn't do a bailout, as it didn't in the case of Enron, public bloodlust over lost capital makes heads on pikes in the public square practically a requirement.

When the government does a bailout, there's no acute sense than anyone is suffering too acutely, and therefore there's no need for prosecutions.

Bailing out Enron would have cost less than other recent bailouts. https://www.propublica.org/special/government-bailouts