Honestly, this sound like more of a rationalization than a criticism. The things that McCain continued of Bush's are things Obama continued anyway. Gitmo is still open, we are still hip deep in Afghanistan, etc.
The point is, you guys can't keep complaining about the lack of moderation in the GOP and then never support a moderate or centrist when he comes along.
Ironcially, Romney was a centrist, but figured out there was no merit in it, so he embraced the right wing crazy in a way McCain never would have. You think McCain would be standing on a stage with Donald Trump while he spouted birther nonsense?
Consistency is important, and people sense a phoney. McCain would have had more credibility had he stayed the same maverick throughout the Bush years. But he didn't. He became another Bush mouthpiece.
And in 2010, he abandoned a career's worth of credentials to go hard Right, rather than doing the hard work of actually defending his stances and letting the chips fall where they may.
McCain would have just been smarter than to even let Trump get near him.
Are you aware that Trump's grand total of contributions is only $3500, with none of it going to Romney?
So it's not like this clown is a big donor who you don't want to piss off.