If the claims of massive fraud had some basis, one would expect that at least some courts would have at least considered them.
This is a false dichotomy.
You are assuming that there would be no benefit for the courts to just ignore the evidence, or even just that they all hate Trump.
But they don't- and they didn't .
Now we even have a Republican congressman leaving the party over this attempt by Trump to steal the election:
Michigan Rep. Paul Mitchell quits Republican Party over Trump's election fraud claims
yes, I got this headline off one of the mainstream media sources. It is still a fact. Here's a quote:
"unacceptable for political candidates to treat our election system as though we are a third-world nation and incite distrust of something so basic as the sanctity of our vote."