Yes, there was fraud - a lot of fraud, in fact. It largely occurred in big-city precincts where virtually no Republicans have been elected or appointed for generations.
Why don't Republicans fight back, then?
There are several reasons, I believe.
They are afraid of the backlash likely to occur, and given the near-total dominance of Democrat liberals in the culture, the news media and social media, they are justifiably worried that only one side of the story will be told, as has been the case since Election Day.
There is also the matter of the legal "team" that Trump promoted or allowed to represent him, whose efforts have been disorganized, hyperbolic, unfocused and sometimes plain embarrassing.
The courts, including the Supreme Court have been loathe to get involved, as they are concerned about the effect of legal challenges to a national election in a country that is already bitterly divided, paralyzed by a pandemic, and simmering with social unrest.
And then, there is Donald Trump himself, whose behavior during this time has seemingly distilled all of his worst impulses, and detracted from the reasons that so many people voted for him in the first place.
So, while I'm angry about the result and about how it was achieved, I believe that it is time to get over it, and plan for the battles ahead.