To be more specific, they have learned to expertly lie and manipulate for evil ends while acting like the hero and abusing their power. And we'll never be able to know the full story, which ones were better and which ones were worse, and which ones have seared consciences. You can't just let them go on like normal. You can't expect them to reform, so you have to keep them in situations where they can't do too much damage. And people have to know who they are, just like a child sex offender today, because otherwise they are too likely to take advantage of systems and work their way back into power. Power is an addictive drug and they'll be craving it again.