Well, some of them are the establishment and their sycophants who know their gravy train is tied to the system as it is... for them they will do anything to keep the system from changing, and have no qualms seeing Hillary in the White House to do it... basically these are everyone who is an R and has stated they will vote for Hillary.. among many others.
The rest are people just working through their sour grapes because they supported someone else, or they do have reservations because Trump’s brash style isn’t to their liking.. the overwhelming majority of these will end up supporting Trump in the end.
I hope so. You don’t have to like the man to vote for him.