If you two have a dispute over something, I expect it to be discussed. If one of the parties involved refuses to do so or accept the results of community consensus, then let me know, I will deal with it from there.
Okay then, let's discuss Machinedramon. For starters his army wipe out a sizable portion of the Geckomon kingdom. As for his own personal crimes, he bombs his own city trying to kill the heroes, enslaves hundreds of Numemon, blows a henchman's arm off for failure, expresses a desire to kill Kari as painfully as he can, and massacres the aforementioned Numemon when they try to stop him. In addition to all that, there's a spinoff game series which reveals he survives his fight with Wargreymon and becomes Millenniummon. In that form he infects Ken with a Dark Spore which leads to him becoming the Digimon Emperor, and later reduces an alternate reality to a near-lifeless husk. He has no redeeming qualities whatever in his original form or as Millenniummon. One argument I've heard some people make is it's debatable whether Millenniummon counts as a different entity from Machinedramon, since he's a fusion of Machinedramon and Kimeramon, but even if that is the case, Machinedramon's influence would have played a large role in shaping Millenniummon's personality, so that would still count in his favour in the same vein as Deviot.
To be fair, Chris didn-t directly kill them. They were died while testing the challenges and while Chris obviously doesn't care that is not the same thibg as him killing them in cold blood like Scarlett tried to do to the other contestants. The thing is Chris is sadistic but alot of his actions are indirect which I think helps other villains to stand out.
For example, Chris sunk Camp Wawaknwa but it was an accident and it isn't played as heinous as Pahiktew Island's self destruct sequence. Which unlike, Wawaknwa's sinking would have actually killed people.
Plus, Chris has access to alot of money and resources. The only thing Scarlett has over him is intellect.