You are correct, Trump is inconsistent and unreliable. Conservatives are trying to turn him into something that he is not, because he says all the right things on the border. All of a sudden he is defender of christians everywhere, and transformed just like Reagan. (laughable!)
Conservatives are desperate for a good fighter, and will latch onto anyone regardless of credibility and reliability. This is asking for trouble and betrayal later on.
That being said, your candidate Scott Walker has been a disappointment. I have lost a great deal of respect for him. I used to think he was unique in that he had a spine in him. He is looking more and more like a squish. His only claim to fame is the stand with the unions. He has been riding that horse, but all this time he has been wobbly and squishy on multiple issues.
...sad, as I thought he was a decent alternate candidate.
I respectfully disagree with you about Gov. Walker.
You may have another candidate that you prefer but Walker has fought hard against the left in Wisconsin (and their allies who flooded the state with activists and money, and the courts who went after him and his conservative allies) - and won, again and again and again.