The salient question isn't whether the debates are rigged. The salient question is whether it is to Don's benefit for The Following to believe they are rigged. After all, reality for The Following is what Trump says it is.
It is to Trump's benefit, in order to maintain the illusion he is a winner, for The Following to believe he won the election.........so they do........based on lies.
It is to Trump's benefit, to maintain the illusion he is on the side of good, for The Following to believe Biden is corrupt.........so they do.
It is to Trump's benefit, to maintain the illusion he is a victim, for The Following to believe he is being persecuted.........so they do.
It is to Trump's benefit, to maintain the illusion "he alone can fix it," for The Following to believe DC is a dysfunctional swamp and the country is a dystopian nightmare.........so they do.