As an Englishman I can only look at events from a distance. It seems to me that either Trump is extremely stupid and ignorant or he is a conniving conman who is blatantly trying to undermine democracy and con his American followers.
We now have a tape coming to light of Trump putting pressure on officials in Georgia to overturn the legitimate result, magically find enough votes to have him elected, and subvert democracy. This is probably repeated in all the swing States. He was trying to steal the election with bribes, threats and bullying.
Here is what I see has happened.
In the run up to the election the Republicans used dirty tricks to suppress voter registration in democrat areas.
The Republicans then used more dirty tricks to suppress voting (reducing numbers of polling stations creating huge queues)
Trump disrupted the mail service so postal votes could not be counted
Trump encouraged his base to vote in person on the day
The democrats encouraged their voters to vote postally
Before the election Trump started talking of widespread fraud and claiming postal votes were fraud
A lot of Democratic voters, having more college level education and being aware of the pandemic, voted by mail (as urged)
A lot of Republican voters, less well educated and believing the pandemic was a hoax, voted in person
It was widely predicted before the election that as the votes cast on the day would be counted first, followed by the postal votes, that it was likely in a number of the close-call swing States, that Trump would start out leading but as the postal votes were counted that lead would evaporate and Biden would win. That is what happened.
Trump claimed to have won the election based on the early count. He tried to stop the postal votes being counted. He claimed that the postal votes were all fraudulent. He asserted that the election was being stolen.
The official observers (international and internal) asserted that the election was fair and that there were no irregularities or fraud.
Now, either he is stupid, and doesn’t understand the very obvious process that took place.
Or he is a conniving swindler who set out to deliberately undermine democracy and con his supporters out of their money.
Trump put in dozens of lawsuits aimed at throwing out postal votes, stopping the count (while he was ahead) or claiming mass fraud. All were thrown out as there was no evidence of fraud.
He stoked up the false claims of mass fraud and stolen election and asked his base to send in money. He’s since made nearly a billion dollars! Not bad for a conman.