That's not really true at all. Court cases are about what the prosecution can prove, not what everyone 'knows.' A large number of the witnesses in this case will also have been complicit in the whole thing, which can be used against them.

Trials are time consuming, expensive, and this one will be an absolute circus of media attention. Seating a jury for this will be a task in itself. Not to mention potentially highlighting instances of government agencies/watchdogs failing to do their jobs appropriately.

I don't think anyone expects the dude to walk but certainly there will be an attempt at a plea deal even if this ultimately goes to trial.