Or suggesting that people in finance are the ones who actually know what's going on:
Yes, the "revolving door" idea can be problematic...but so is trying to regulate without knowledgeable professionals.
As an example, I'd point to Tom Wheeler, head of the FCC. He may have come from a telecom and lobbyist background (and even got the John Oliver insult treatment a few years ago), but he's shown that he's completely willing to put forth regulatory schemes that the big telco players *do not like*
There's a difference between corruption in the revolving door and people coming from industry and being willing to actually play the regulator's role. Heck, I've worked for and against the same clients at different times--I'm perfectly capable of doing good work for whoever pays my bills, without thinking I have to fudge the numbers in favor of my old boss.
This is so naive.