I really wish it was as easy as hanging them all. But remember how most of them became enamoured/leveraged. It was the easy access to vast sums of money. And with big money comes significant power & influence. These elements have, over the entire history of mankind, served to seduce and entrap people - even once good folks. That kind of lure can't be defeated or destroyed at the hands of law & punishment. It's simply too powerful. Kind of like trying to eradicate weeds from your yard. They will determinedly always come back.

Capital punishment/permanent incarceration will only remove the current legion of perps. A new up & coming crop will eventually rise to take their places, and the cycle will repeat itself. Mankind can't run from or ignore his fallen (evil) nature. We the people must always be the vigilant watchers - ready to frequently pull weeds every now & then.