Buckley at least kept his arguments within factual knowledge.
Buckley:
a) recanted of his racism (found in a few of his earlier writings)
b) repudiated the anti-Semitism of Patrick Buchanan BY NAME
c) was so put out with liberal Republican Lowell Weicker, the CT Senator in his home state, that he went out and got a Democrat named Joe Liebermann to run again Weicker because Joe was more malleable and "to the right" as a moderate Dem than Weicker was a Rep.
d) debated even his "own side" on issues important to him (ex: Reagan on the Panama Canal)
Whether you liked him or hated him, he acted on principle as did Krauthammer and George Will (both of whom left the GOP along with Tom Nichols)
There are no principles left from the former party of principle.
Earle's comments are similar to mine and quite frankly similar to what Ronald Reagan said about the Democrats when he left: "I didn't leave them, they left me."
Buckley would probably despise Trump as much as any poster on this board does.