That‘s not the point (that fraud may happen in any election). Trump asserts that there was systematic fraud in large numbers, in a way that the outcome of the election was changed. And many of his 70mm voters may subscribe to his point of view. This will increase the hostility between the two parties in the US.
When I see Trump talk, I wonder if he really believes what he says or if he knowingly and willfully lies.
What this man has done in four years has put a great damage to the democratic culture in the US, and he badly harmed the reputation of the US around the world, especially when it comes to old allies in Europe.
Edit: If Trump was not a narcisstic egomanianc („I WON THIS ELECTION BY A LOT“?!? Wtf?!), he would have stepped up in dignity, conceded his loss, congratulated Biden and wished him well. The US is confronted with many challenges in the midst of a huge pandemic, the nation is divided, and all he has to say is he won by a lot (in big letters)?!? This is it?