Okay, I read through Biden's speech. What it amounts to in a sentence is You are either with us, or against us. It is probably the most divisive speech by a President in modern history.
Biden repeatedly says, in one form or another, that "MAGA Republicans are the threat." He tries to delineate these from other Republicans by saying in various slanted ways that those that aren't a threat are the RINO's and others that more or less accede to the Left and vote with them. That is, Republicans that go along with the Democrat party / Left, like Cheney, McConnell, Romney, Kinzinger, or Graham, are just fine. They go with what the Left wants in the end so they're no threat.
The ones Biden is railing and ranting against are those opposed to what the Left wants. That's probably best summed up in this paragraph from his speech:
That is to say, in Biden's world "MAGA forces" are opposed to the Leftist agenda and that makes them evil enemies of the state.
When Biden says this is a "threat to democracy," what he means is it is a threat to the Leftist agenda and that has to end by any means possible. He even says so:
What he's really saying is that those who won't go along with the Left's agenda are a threat to the Left and have to be eliminated so the Left can have their way unfettered by democracy.
His only example of this outside the one I gave above, is Jan 6. That's become the Holy Relic of the radical Left to bash half of America's population with.
The greatest hypocrisy in the whole speech comes when Biden says this:
Yea, like the likes of The Squad--AOC et al., Maxine Waters, Chuck Schumer, and Adam Schiff as but a small sampling of the radical Leftists within the Democrat party that have repeatedly and openly called for violence against their political opponents. Toss in his VP who contributed to a fund to get violent, radical Leftist, rioters out of jail so they could continue their violence in the streets.
Most of the rest of the speech is empty platitudes, rhetoric, and drivel. The heart of it is that the radical Left is incensed that there is opposition to their political goals and remaining in power and that these must be crushed by any means necessary.