By now, it is an event as regular and predictable as the tides: a Democrat wins an election, and Donald Trump says that that election was rigged. There does not need to be any evidence for this; indeed, there never is. Trump will say it anyway.
He rallies the rightwing media ecosystem to spread the lie; he convinces his followers to believe it. That this, by now, is a repetitive spectacle, devoid of suspense, does not mean that it is not dangerous.