What would you tell the even more millions of people that voted for someone else?
There’s not ‘even more’ millions for your guy. Trump has the most votes by millions and millions.
Whoever wins by such a wide margin tells the other side they lost. They don’t even have to tell it, it’s always been accepted that way. It’s bizarre that you are even asking the question.
But if the other side says well we don’t care, we are going to just win one way or another, then free democratic elections are lost. And Revolution follows.