I agree there is a logical trap in claiming fraud has occurred without sufficient evidence to prove it. I had previously written about the reverse logical trap of claiming the election was fair and that consequential fraud did not occur. https://caleb-mars.medium.com/a-statistical-framework-for-evaluating-the-fair-election-hypothesis-8d9f5908f1ad The failure to prove fraud does not prove the election was fair.
The fact is the election protocols were changed in ways that made it easier to cheat and a lot harder to get caught. The legality of these changes is questionable when made by governors and judges, but not state legislatures. That makes people suspicious, but it does not prove fraud.