On another note Biden is over 5 MILLION votes ahead!!!
This is key. It's a bit hard to get sufficiently emotional about how Trump was robbed the election given the scale of the popular vote victory.
That being said, there was likely a significant amount of low level voter fraud, due to the ease compared to most elections. It does take a bit of a conspiracy theorist to believe it was systemic and coming straight from the top (although hypochondriacs get sick too sometimes, and conspiracies are sometimes real), but it definitely happened on a small level in many instances. Whether that would have tipped the election is another story.