As a concerned citizen, naturally I don't want the USDA Director working for Kraft. But what do I care whether the director goes on to work at Kraft afterwards

As a concerned citizen, naturally I don't want the USDA Director working for Kraft. But what do I care whether the director goes on to work at Kraft afterwards? Or even came from Kraft in the first place? I'd prefer we have qualified people in public office. Proven managers, subject-matter experts, etc. If we erect a wall between private industry and public service, we're not going to get that. If there's a problem with the director of the USDA being able to let his former-employer slide, that's a separate problem than where (s)he came from or is going. I'd prefer we deal with that, than try to police people's careers.