Are you saying that there is no circumstance, fraud, murder, Manchurian Candidate or any criminal act that the Vice President could declare voids the election?
The only way to even legitimately contest a state’s electoral votes is for someone in a position of legal authority IN THAT STATE to notify Congress of the fraud, malfeasance, etc. that questions the validity of the electoral votes that had been sent to Congress. Preferably, this would be done by a state legislature that also votes on a competing slate of electors and sends them to Congress.