The Republican party has done nothing wrong or inappropriate, They have simply been fucked by an infantile billionaire with instant name recognition, catering to a gullible minority of the voting base.
The Republicans started off this season with a virtual all-star team of candidates, any one of whom would have made HRC look like the unaccomplished old crone that she is. Trump has fucked this up royally, and there is probably no cure.
Trump is not a Republican. He is not a Democrat. He is a Trumpian. If he is nominated I will vote for him only because the opposing candidate would be, Constitutionally speaking, the Devil incarnate.
He brings a few things to the table, but to me they are illusions. He won't be in the pocket of any donors because he doesn't need them. He doesn't have to cater to any interest group because he simply doesn't give a shit about anyone but himself. He seems to know a bit about negotiation, but that is yet to be seen.
He stumbled upon the immigration issue and recognized what a populist Home Run that would be, but the closer you look at his ideas the more ridiculous they seem. His guiding motto ("Make America great again!") is worse than "Hope and Change," and just about as substantive.
It is not clear to me whether he has attracted people who are as infantile as he is, or he has indoctrinated them into his toddler mentality. The OP is Exhibit A. If you want what's best for America you will not throw a tantrum and sit out the general election just because this particular asshole is rejected by the Party he has tried to co-opt.
But that's assuming you have the capacity to act like an adult.