Here's the one lesson I really want us to all learn from this: the only thing the rich fear is prison because prison robs them of time. Fines are just the cost of doing business. There are many other scandals: the whole subprime disaster, pollution from plants and the like where no one went to prison and people really should've.
What is this obsession with jailing people? Prison is pretty inhumane, especially in the context of a limited lifespan. Even if we're immortal, it's still inhumane. Moreover, how does making people go to prison fixes anything? It's just a way to assign punishment and blame people.
Beyond that, prison is inhumane as a rough function of where you are. Maybe you're thinking of a particular prison system.
How does it fix anything? It should primarily be a deterrent, and secondarily a way to protect society from dangerous people.