Yes lying is protected in this democracy, unless it hurts someone.
Even if it hurts someone, most of the time. Hurting feelings, upsetting people, offending people, etc., are all free speech. What isn't free speech are things like fraud where the crime isn't the speech/lie, but the obtaining of money or other thing of value, and similarly, defamation, there has to not only be a false statement but one that causes injury to a person's reputation, etc. - provable injury - not just a false statement that upsets someone.
Lying can have consequences,
Sure, but saying the 2016 election was stolen, while a lie, ought not have legal consequences, right?
the insurrection was the consequence of Drumps Big Lie,
So? BLM riots were the consequences of big lies about how often black people are subjected to police violence. So?
ead to the assault on the Capitol & Metro Police & the Capitol itself. The Drumpf's incendiary rhetoric urging the Cult to Fight like hell if they wanted to save the country they loved,
Both democrats and republicans, almost to a candidate, urge their supporters to fight like hell to save the country they love. That's not illegal.
on top of all the behind the scene plotting, claiming he won the election when he knew perfectly well that Basement Joe Had Beaten him like a drum.
There is nothing illegal about disputing the results of an election, even if the evidence isn't in, yet, or even if one is in the minority view of what happened. That's why it's just fine for Democrats to claim the 2016 election was stolen. They even spread falsehoods about Russian collusion - which are completely evidence-free - and there aren't and ought not be legal consequences for doing so.
Incitement is not protected speech,
Sure, but incitement means that a person literally calls for violence. Incitement is not "saying inflammatory things and having people go do something stupid as a result." If your preferred definition applies, then anyone supporting BLM and Antifa demonstrations is inciting the violence that occurs sometimes among those demonstrations.
but not easy to prove. If the Drumpf is ever charged for his role in the plot, I think it will be a slam dunk for the Prosecution. Of course one MAGA on the jury & he wins again.
Of course it's not easy to prove, nor should it be. You don't even have evidence of a "plot" much less a role Trump played in it. All you have is a bunch of people rallying their base, and then a demonstration getting out of hand as potential FBI informants egged them on to enter the capitol building.