The GOP is the only real alternative to the Democrats, and the Democrats are clearly beyond redemption for the time being, what with their Clintons and all, and their categorical rejection of their few decent possibilities, like Jim Webb.
And despite the horrible behavior of the mass of Republicans over the last few decades they remain, believe it or not, a better deal than anything the Democrats could conceivably come up with;
And, in my opinion, they've come up with a nominee, in spite of themselves, that actually has the potential to be a very good President.
Almost all Trump's detractors among the Republicans keep saying that he's not a conservative. Of course, the Republicans haven't nominated a conservative since Ronald Reagan, and you can even quibble about him. So in my mind, with his explicit nationalism and interest in border control, is more conservative than all his sixteen former Republican rivals.
And beyond ideology, Trump has added something to the mix. One thing Republican Presidential candidates have failed miserably to do, at least since Reagan, is to oppose Democrats in anything other than the most perfunctory way. John McCain famously refused to criticize Obama, and the other candidates — even the Bush pair — have done little better. But Trump gets belligerent and forceful and hits his opponents hard. Maybe that's why he seems like a liberal to some Republicans. All the other candidates surrender before the fight starts. Maybe Trump has started a trend.
More on that from the Anonymous Conservative blog [link]: