By and large Republicans don’t want to be leaders. There is no fire in them at all. No passion or strongly held convictions. They are like flotsam floating down the river.
Trump is the opposite, of course, and he actually stands up for his beliefs. In so doing, he shines an unfavorable light on the rest of his party. Which is why so many in the party detest him.
The thought of working in government does not animate conservatives the way it does liberals.