The problem people like Mitt Romney have with Trump is that their apparent sobriety and sense of decorum are an act. He is not serious. His fellow RINO’s are not serious. They stand down to save face every fucking time they are challenged. They are Milquetoast assholes, who by their actual BEHAVIOR betray a lack of principle, and if you lack principle, no matter what act you may put on, no matter how you dress, or how seriously you talk, and how obsequious to abusive standards of behavior you may be, you utterly and completely lack gravitas.
Here is a counterintuitive truth: Trump fundamentally has more gravitas than Mittens. Trump has beliefs and he acts on them, consistently and daily. Mitts has beliefs right until the moment he has to be impolite to call bullshit on the latest left wing outrage, and then he is a fucking scared puppy on the corner. I personally will never forget his failure to call Obama a liar to his face, when he was lied to, to his face.