Why would anyone care what the McCain family does re: Donald Trump? McCain proved to be a loser and grumpy old man. In the end, he lost most of his former reputation as a heroic POW, and patriot.
He certainly did for me. I gave him that due for many years (I actually served under him for a short period of time) but after what he has done, his corrosive misdeeds (ending with his dossier role) has obscured all that in the same way Benedict Arnold squandered any good will Americans like me may have had for him.