We do not know that every Biden ballot is a fraudulent ballot, but we know for a fact that every fraudulent ballot was a Biden ballot.
I agree with you.
“we know for a fact that every fraudulent ballot was a Biden ballot.”
We can’t prove that. It’s probably not even true.
Heck, it might have been smart for Biden folks to have cast a few fraudulent Trump ballots. Then they can claim, Trump does it, too.