I don't think there's any reasonable argument for laying any blame upon Biden. To my knowledge, no presidential candidate in history has waited until all the vote counts are certified to declare victory.  That is a ridiculous standard to expect.  Yes, the moderator used that term, but Biden did use it not in his reply, and it's clear that his intent was to say that he would wait until the counting was completed to such a point that the winner was clear.  Because this is the standard that everyone uses and has used in every previous election.  And Biden did in fact do this.  Unlike Trump, he did not declare victory on election night, nor in the intervening days when counting was proceeding.  He waited and only did so when the initial counts had mathematically eliminated any chance that Trump could win.  The notion that he should be held to some sort of different, more extreme standard than every candidate in every previous election is just plain silly.

Republican behavior now is cynical political calculus.  They know that if they openly acknowledge that Biden is the winner, they will be at risk of criticism (and future primary challenges) on the basis that they were insufficiently loyal to Trump.  Simply saying that Trump has a right to challenge the results without also acknowledging that Biden clearly appears to be the winner gives credence to Trump's baseless claims that the election has been stolen from him.  In doing this, they do in fact seriously undermine faith in the electoral process for their own political gain.  There's no ethical or moral justification for that.

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Gee, just like Pompeo, I was clearly joking....

You're 100% right about previous presidents and previous elections.  This year is different.  Consider the context of the question.  We're in the middle of a pandemic, most states are moving to mail-in ballots (that have to be manually sorted) for the first time, and there were widespread expectations that the postal service could experience problems handling the volume of ballots.

So we knew going into this election that because of those differences, ballot counting would be slower than normal; that we might not know the outcome of the election on election night; and that people would be impatient if the process dragged on for several days.   

Chris Wallace was asking both candidates how they would handle the delays, and what they would tell their supporters to ensure the public remained calm while the process plays out.  

Biden understood that results would not be certified until December, but that is the commitment he made under exceptional circumstances.  

The purpose of declaring victory now is to put pressure on Trump to concede.  So Biden is helping to create the tension that is leading to the public's perception of a crisis. 

Biden could easily have adopted a different narrative such as: "it looks like we won the election.  We will wait until the vote is certified to declare victory, but in anticipation of that, we have begun to assemble a transition team, etc."

They are both at fault, along with conservative media pundits who are pushing left wing conspiracy theories, and left-wing journalists who suggest that a coup is underway.   

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Please be sensible.

Biden waited patiently until there was a consensus of who won the election. Media outlets have gone out of the way to err on the side of caution. CNN, for example, went out of their way to not call Arizona for days and days and days, even though the writing was on the wall. They still haven't called Georgia, even though Biden is 14,000 ahead with 99% of votes counted. They didn't want to make any mistakes. They waited much longer than normal to call a winner.

Everyone accepts that Trump has lost this election. The media. Republican Senators. World leaders. Reportedly even Trump himself has privately accepted he has lost.

Yet in public Trump puts on a show against all reason and facts to say that he is the winner....by a big margin... if you count the legal votes.

These are all false things. The media reporting Biden as the winner is a true thing. Yet it's Biden and the media that are creating the false perception?

There is no reason at all to block Biden from intelligence reports; to withhold messages from world leaders expressly sent to him; to withhold funds promised by law for a transition of government.

Trump firing people in key positions, such as the head of the FBI and senior defence officials like Mark Esper, is not a conspiracy theory. It is objective and undeniable fact.