They have a unique experience that can’t be gained elsewhere, you can’t regulate an industry you don’t understand and you can’t understand the financial industry without working in it.
So people move back and forth between legislators/regulators and compliance/lobbying.
The only solution is to pay them more but not only it’s not possible it’s also not going to solve anything sometimes people just get bored and want to switch roles. Cooldown periods might help but only a bit as you can’t generally prevent people from gaining employment and if you refuse to hire anyone who has had recent job experience in the financial industry your regulation would be ineffective.
Cooldown periods might have helped if it were not for the simple fact that many of the position offered to past officials are in fact very well compensated board:committee seats that require very little activity. The implicit assumption by both parties is this is for services rendered during office.
Industry experts will be in the pool of potential regulators - but that regulatory position used to be stable and lucrative enough to be the final destination as opposed to a stepping stone where scratching a few backs by relaxing some regulations could land you a future cushy job.
I work in the biotech industry and you see lots of people who move from the FDA to companies and back.
But if you're a company trying to get a drug approved, who else are you going to hire? Same with the FDA. If they're trying to regulate manufacturers, hiring someone from a manufacturer is an ideal way to get that talent.
I'd be satisfied with some strict rules around lobbying and gov't influence. But banning people from moving around? That seems excessive and likely detrimental.
Alternative: if you are a banking government boss type of position and go work in the private sector, don't work for your 'opposition', instead use your skillset in an unrelated area. It's pretty silly that we have to spell this stuff out for those people or even make laws about it since it's to blatantly obviously unethical that you'd think that even they can see that.