Let me put it this way. Forget the name is Trump. If a candidate could guaranteed fix everything that's wrong in this country the way the Republican Party thinks it's wrong, if it were a slam dunk, if it were guaranteed, that candidate will still be opposed by the Republican Party establishment. If they've never heard of him before or if he's never been in politics before, if he's not part of the structure, the infrastructure, if he hasn't paid his dues, if he's not part of the clique, they don't want him in there. It's exclusionary and it's got all kinds of people who want to get into it, who want to climb that ladder, who want to be at the top, and you just don't get there.
In many ways it's not merit based like so many other things in life are. So there is a natural enmity to outsiders, to intruders. And when an outsider or intruder gets in, gets a nose under the tent and starts making noise, then the establishment lifelong members start caucusing together to figure out how they can get rid of this intruder who might just shake everything up. When it comes time to get rid of the intruder all they know to do is what they've always done. They go to their playbook. Whatever party politics playbooks there are, they go to them.
(*Isn't The Dealey Plaza play in those books ?)