It's your burden of proof! Millions of ballots were sent to dead people. You say none of them voted, but you do not have evidence to prove it.
My larger point is that we need national standards to ensure this problem and others would be minimized. We need a more open transparent system with voting and registration manifestly less prone to fraud and abuse. Otherwise we keep going back and forth about who has the burden of proof. Though I have to admit it amazes me how people defend as totally above reproach a process that sends out ballots to dead people.