I think you're missing an important element into this type of personality. While it's a human trait, the Republicans and conservatives in the US right now self-select towards it, so there are a higher percentage there than in the general population, in addition to it being more common in politicians that make it to that level anyway.
They're arrogant.
You need to have a certain level to get that far in the first place. Why would these people keep taking positions from a brazen and chronic liar who demands loyalty to himself but displays basically none to the point of being eager to throw even loyal lackeys under the bus for the dumbest reasons? They blame the people thrown under the bus. It won't happen to them because they're better at it or more valuable than those other guys. This is reflected in their overall ideology. They value 'self-reliance' and 'personal responsibility' and 'strength' (in scare quotes for the fact they don't actually identify these traits very well). Something bad happens to you? Try harder, to better, and get out of the way you loser. Even people who should know better think that, for example, if society breaks down they're going to do well even though if you had the knowledge to actually stand a decent chance at making it through you'd be well aware that no one is actually safe in situations like that. They're 'special' and the rules don't apply to them.
That is nowhere near the only consideration, but it is an important one to keep in mind when trying to model their behavior.