The problem with the republican party isn't Donald Trump. The problem with the republican party is that its filled with republicans. Ferchrissakes...virtually every one of the republicans mentioned is willing to vote for the most unqualified upright walking mammal ever nominated by a major party simply because, for them, party always comes before country. 

Trump is the ultimate product of the forces unleashed through the decades-long  pandering to the worst elements of the American electorate. As a result of that pandering, the modern GOP is a white nationalist party and Trump is the perfect representation of that modern GOP. 

I will happily vote for Clinton because she is exceptionally qualified for the job and I trust her infinitely more than I trust Trump. And a Trump presidency would be an extinction level event for American democracy...so there's that.