Mengsk's backstory is schizophrenic and grimdark af
Although Arcturus Mengsk is depicted as the generic Saturday morning cartoon villain of the franchise (aside from... all the others), his actual backstory is that of a sympathetic hero up until the actual events of the game. In the game he starts off as a heroic rebel leader, then becomes increasingly morally ambiguous until he becomes a villain at the climax by betraying his loyal subordinate Kerry. There's no logical reason for him to do this besides personally insulting the player by killing off a likable character, since none of his other criminal actions are sufficient to make him a villain apparently (which reflects really poorly on Kerry and Raynor... but I digress). The "official" in-universe reason is twofold: firstly, he was tired of her developing a conscience that would lead to her leaving him as she planned to, and secondly, she murdered his family while brainwashed . Oh my. Yeah, Mengsk's backstory is super dark. He was the scion of a rich politician f...