Yes, Trump would never be a viable option for president in any functioning democracy. Sure, we can choose who sits in Congress and the White House, and then they serve the same nefarious interests as usual. Our "democracy" is in the hands of defense contractors, Ukraine, Israel, Wall Street, and corporate America. Good luck trying to reverse that.
The Dem primaries certainly aren't "free and fair." The DNC clearly had their thumb on the scale for Hilary in 2016. In 2020, mainstream media outlets from NBC to The New York Times admitted the 2020 Iowa caucuses "tarnished the vote" and were "a system wide disaster." A Politico article stated that "DNC meddling led to Iowa caucus debacle." Both parties scheme to get the establishment's pre-approved candidates on the ballot ahead of time. The Dems are even worse at this than the Republicans. Aside from blatant meddling, they also have superdelegates. In contrast, neocons never wanted Trump to be the Republican nominee. Their plot to anoint Nikki Haley isn't going as planned either.
As far as Trump trying to overturn the 2020 election goes, what was the motivation behind Russia-gate in 2016? They're all crooks trying to cling to power any way they can.