As a devoted Enronista, I've been following John Arnold for years and years.
I'm happy to say that his continued campaign to destroy pensions - one dating back to the pensions Enron destroyed when it bought a utility so it could trade electricity, the retirement Enron's rank and file didn't get because John Arnold took a (non) retention bonus that doomed the attempted merger, those pensions bankrupted with Enron's collapse, and those counting on UBS retirement cash (that little interlude in his career rarely gets mentioned, maybe because it ended up that without controlling the platform and tolerance of insane risks, Arnold wasn't such a hot trader) - but I digress.
Do check out The Truth About John Arnold. It isn't pretty, but it's important.
(I'm pretty sure that he wasn't the second youngest billionaire, by the way, but it's not something to research on a school night.)