I wouldn't call it revenge, but rather justice. How does one respond to someone who was involved in orchestrating a plan to potentially disable or kill you, and then indirectly threatens to do it again?
They harmed a lot of people, and have the potential and willingness to do it again. I don't think that is something we should sit by and allow to happen.
No doubt we are all susceptible to corruption. I don't believe many (most?) would be willing/able to go to the extremes that some of these people have. There are just some things I wouldn't do for money or power.
Ultimately I have little faith anyone will be held to account directly because of the system in place protecting them, but one day enough people will be aware of what has been and is going on.