One of the articles about Lay said the concept of finality holds that the state doesn't really consider someone "guilty" until they've exhausted all appeals.
Let's say I've got some heavy-duty debt. I tell the creditors I don't intend to pay them back, and never did plan to. That makes it theft, right? But that's civil, not criminal ... why? And why does that obligation outlive you, but criminal forfeiture doesn't? How would I get my debt turned into a criminal matter so I can have it wiped out by my death?
Now there's some creative estate planning for you.