Ultimately it'll happen if there's enough evidence to prosecute. I think one thing we're learning as a democracy is that the law has to be applied fairly to everyone. Just think about how damning the invasion of Iraq has been. It would be a totally different narrative if Bush and co. were properly investigated for their role in potentially lying about the invasion. The issue is that these lessons move at the speed of democracy, which is quite slow, and it's fundamentally a political process at that. Therefore, it's up to voters and that takes time and access to information. On the other hand, I'm not aware of a better way to do things.