There are tapes of Trump sounding like a two-bit mobster. The GOP did not dispute the evidence, they just refused to convict because it wasn't "serious" enough.
If Trump had backed down that might have made sense, but instead it emboldened his lawlessness. We're now at the point where his undermining of the voting process is entirely expected and hardly even noteworthy.
Disputing the vote and questioning results is very common in elections. Don't pretend like Trump is the first to do this, or the first to insinuate that fraud has influenced the result. It's pretty run-of-the-mill politicking. Here's Hillary doing the same thing, except she's blaming nefarious foreign actors instead of the local machine:
The simple fact is that Hillary simply couldn't believe she was defeated, and did as much or more disputing of results. That doesn't make her an enemy of democracy, and neither does Donald Trump's caterwauling. But if you read the recent news reporting or watched the current President-elect's speeches, you would think that the very foundations of Democracy are shaken. Utter hogwash.
If Trump had backed down that might have made sense, but instead it emboldened his lawlessness. We're now at the point where his undermining of the voting process is entirely expected and hardly even noteworthy.