Your whole message boils down to they didn't have the drive to do what Trump is doing. Trump didn't start off with total support. The mainstream Republicans thought he was a joke, fox thought he was a joke, and unlike Obama and Biden he put very ideological people into the supreme court.There's no way that a democrat would have been able to act like trump for myriad of reasons
The supreme court are not democrat friendly and if Biden or Obama tries to ignore the courts ruling then they lose the support of even their own party in congress
The media, despite what some believe, are not particularly democrat friendly and Trump essentially has his own state media in fox news to spin his authoritarian shyt or even not cover it
They didn't completely own democrats in congress the way trump owns republicans in congress who dances to his every whim
And then there's the voters who are hollier than thou and whose left factions are purist to the core
neither obama or Biden had all these factors working in their favour
So basically Trump is able to do this because He has the supreme court, a very friendly media (fox news), a mainstream media that are shook of him, the total support of his own party at federal and state level and finally a base that craves authoritarianism against those they deem as enemies hence why their entire motivation is based on owing the libs
Obama let the Republicans block his supreme court pick and Obama was trying to put in bytch ass Merrick Garland. Trump campaigned against Republican Congress people who tried to oppose him.
Leftist purity culture is a myth, the left overwhelmingly voted for Hillary, Biden, and Kamala