Trump isn't necessarily the one running the show. Well… Donald Trump, at least. Melania comes from an interesting nexus, of sorts, from which all royal lines ultimately descend. Which is also where my family comes from, but we kind of decided such things were not all that important when we came to the U.S.
Anyway - "no deals" means no deals outside of the law. And even then - plea deals aren't necessarily going to result in a meaningful change of sentence.
The long list of means used by these people to entrap others and force their hands, as well as the general circumstance of some of these people being raised in a pattern of abuse, means that there is some leeway for "redemption", of sorts. This isn't a lazy novel where the only way villains can redeem themselves is through death. There are those who can be redeemed, and a path for that is appropriate.
The problem with "deals," however, is that we are dealing with humans, not demons. Demons are contractually obligated and bound by the exacting terms of their contracts. Humans… Have that pesky free will thing. Making deals with evil humans us just stupid, as they have no obligation to uphold them and every duty to do what nets their own advantage over you. Not that making deals with devils is wise.
Do you really think Clinton is going to stop lying or working to destroy the country? No. She is going to continue come hell or high water.
Frankly, the devil, himself could appear before these people and tell them they are out of line. They would kill him and then fight with each other to be king of hell while they are at it.
You can't reason or negotiate with those types of people. You can force them to pretend to show respect/regard, but they will sink a knife in your back when they think it advantages them to do so. They have no concept of law and no concept of morality. They are psychopaths who learned to become pack predators, and they are as brutal to each other as they are to us, if you can believe it.