Jesse Eisinger writes: Last week, I had a conversation with a man who runs his own trading firm. In the process of fuming about competition from Goldman Sachs, he said with resignation and exasperation: “The fact that they were bailed out and can borrow for free — It’s pretty sickening.”

Though the sentiment is commonplace these days, I later found myself thinking about his outrage. Here was someone who is in the thick of the business, trading every day, and he is being sickened by the inequities and corruption on Wall Street and utterly persuaded that nothing had changed in the years since the financial crisis of 2008.

Then I realized something odd: I have conversations like this as a matter of routine. I can’t go a week without speaking to a hedge fund manager or analyst or even a banker who registers somewhere on the Wall Street Derangement Scale.

That should be a great relief: Some of them are just like us! Just because you are deranged doesn’t mean you are irrational, after all. Wall Street is already occupied — from within.

The insiders have a critique similar to that of the outsiders. The financial industry has strayed far from being an intermediary between companies that want to raise capital so they can sell people things they want. Instead, it is a machine to enrich itself, fleecing customers and exacerbating inequality. When it goes off the rails, it impoverishes the rest of us. When the crises come, as they inevitably do, banks hold the economy hostage, warning that they will shoot us in the head if we don’t bail them out.