In a large enough organization with many layers to it, it very well may be that executives were neither involved nor aware of criminal wrongdoing, and even when they are, you'll never find sufficient evidence to charge them. That's largely the point behind performing criminal acts as a business and why there's so much white-collar crime.

At least if you set fines to a level that such crimes are rarely if ever profitable, you can both remove the incentive for the organization to commit them as well as introduce a passive internal mechanism to prevent them in the first place.