The politicians do it for power.
The 'people' are stupid and put their egos before reality.
They are also inclined to support people over ideas, and many of them legitimately believe the election was rigged because Trump and Newsmax/Foxnews told them so. So in a weird and perverse way, they are 'acting in good faith'.
'The Big Lies' are possible when people are already sensitive about it and 'want to believe it' i.e. they just need a reason to believe.
This is usually what we mean by populism.
I just can’t if you believe in democracy, however it’s still 50% that doesn’t, although 30% that just want to “win” is still weird.