It's like saying the tide caused the flooding when the underlying cause is rising level of the ocean. Sure, the flooding occurred with the tide but it's not why areas are flooding now that have never flooded in our history.
I know, you are going to reply with another stupid argument that won't hold water. But McCain isn't why Biden is winning in Arizona. Hers is a trivial effect. Just like blaming perma-Bernie babies for Clinton's loss in 2016. Both are superficial and ignorant arguments.
But rave on, dude. find another teensy occurance and say that's why Trump lost. Trump lost because the country is headed away from his kind of politics and rhetoric. It was a nail biter. A lot of people are afraid of the inevitable change.
The next election will be every bit as insane and could swing toward the Fascist American Republican Teabaggers (FARTs). But the change is inevitable unless they manage to block people from voting in future elections. I think Trump would have done so if he had won and it's not like he has given up yet either.