How accurate are claims that the US election is rigged?

The Democratic party can only win by cheating on the ballots

Question: How accurate are claims that the US election is rigged?
Position1 of 3›: Claims that the US election is rigged are very accurate
Argument‹2 of 6›: The Democratic party can only win by cheating on the ballots

Claims that the US election is rigged are very accurate. The Democratic party under Biden's administration are rigging the election to achieve victory that will be illegitimate.

The argument

The Democratic administration are attempting to use fears surrounding the coronavirus pandemic and the courts to push through changes to election law that they have been unable to achieve through state legislatures. A Biden victory based on late-arriving postal ballots should not be accepted by the American public, and it is illegitimate.

Premises

[P1]The Democratic administration is using pandemic fears and the courts to change election law in ways it could not achieve through state legislatures. [P2] These changes, such as accepting late-arriving postal ballots, are presented as a route to victory by means other than ordinary votes. [P3] A win secured this way would be illegitimate and should not be accepted. [C] Therefore, because the Democratic party relies on cheating with the ballots, claims that the election is rigged are accurate.

Counter-arguments

The US election administration is highly decentralised. Each individual state is responsible for setting its own election rules and local officials administering them. In the majority of US states, observers also keep tabs on poll workers. There are huge variations in voter ID requirements and voting machines across the US. Therefore widespread election rigging would be very difficult to coordinate.

Rejecting the premises

[Rejecting P1] Litigation over deadlines and ballot receipt is the ordinary mechanism by which election law is settled, and in 2020 it was pursued by both parties and in both directions. Several of the changes at issue were made by Republican-controlled legislatures or by state courts of varying composition, and most were left undisturbed on appeal — none of which fits a description of one party's manoeuvre. [Rejecting P2] Ballots arriving after election day are not late votes. Where they are counted the rule requires them to have been cast and postmarked by the deadline, and the practice long predates the pandemic — military and overseas ballots have been received this way for decades. The premise treats a counting rule as a substitute for votes. [Rejecting P3] The conclusion asks that a result be rejected on the basis of the procedure that produced it, without identifying a single improperly cast vote. It also requires a coordination the system's structure makes implausible: elections are run by the states under differing rules, machines and identification requirements, administered locally and observed at precinct level by both parties.