As a conservative, why would I be loyal to a corrupt organization that holds me in contempt, or to a lifelong liberal simply because he has an "R" behind his name? Neither deserve my loyalty.
My vote must be earned, and so should yours be, or you're following blindly in lockstep. It's no different than black people maintaining loyalty to the Democrats when their party treats them with contempt, as though they're children.
Rick Perry made a fool of himself by branding Trump a cancer on conservatism (he was right), and then campaigning for that cancer. His credibility is shot, much like that of Chris Christie, Mike Pence, and any number of others who chose to hitch themselves to Trump.
Yeah, like I said, I tried to strengthen the country's borders, too, by supporting Cruz---you know, the guy who was talking about a border wall when Trump was yapping on his reality show. If you trust THAT guy to build one, you're going to be waiting a long time, since he and his people have already backtracked on the promise.