You're participating in the same circle jerk.
You've concluded that Trump is a huge Fascist and a danger beyond all other considerations (but not the Democrats, even though they're giving weapons to an ethno-Fascist regime committing Genocide which is literally "supporting Fascism") and you reached that conclusion from consuming Democrat propaganda in places like Lemmy with no actual use of skepticism, so now you repeat it.
Meanwhile all those people who don't think like you and all the posters whose posts you read here, had very different levels in the like-hate Trump scale, and the like-dislike Democrats one, and the trust-distrust what the Democrats/Republicans say scales, the politically engaged scale, the thinking that my vote makes a difference to my life scale, the what matters to me most in life scale and other such scales in human belief and behaviour that together add up to make them or not go vote and for whom they vote, which in this election also included things like the flexibility or inflexibility of one's principles thanks to the Democrats activelly breaking a really strong set of principle for lots of people when they supported with weapons the commiting of a Genocide in first Gaza and now also Lebanon.
The "incompetence" was the Democrats with their words and actions targetting a point in all those scales that turned off a lot more people that it turned on. The 14 million less Democrat votes make it undeniable that it wasn't Trump that conviced those votes to flip, it was the Democrats that failed at convincing enough people to vote for them, so clearly their words and actions turned off from voting a lot of people.
The "entitlement" is the idea that everybody is equally politically aware as you, trusting about what the Democrats say of Trump as you, fearful of Trump as you, trusting that voting maters as you and so on. I've been a member of two different political parties over the years (in two different countries) and this blindness is incredibly common amongst party members: such strongly politically active and highly tribalist people just don't get it that most of voters don't think like them, not even close and it gets worse when they end up in circle jerks like the one here in Lemmy during the US Presidentials - they basically just strengthen each other's beliefs in that what's right or wrong, what will work or not work to help their side and what people think or don't think, all with no actual proof being involved just the say so of like minded people, a pretty straighforward "groupthink" situation.
(In fact it was my experience with canvassing and leafletting in those two parties and countries that opened my eyes to the reality that in terms of engagement and trust in politics most people are nowhere like you and me.)
Even more "entitlement" is the idea that your values, forecasts and interpretation of the world are the right ones and those of the ones who didn't vote are wrong, then compounded with the idea that others should just do as you think they should and if they don't they're wrong (all of which on display in this meme and all the type of posts here blaming the 14 millions) - this a pretty straightforward "I know best and others should follow my lead", pure entitlement.
The "stupidity" is that the kind of people that have been engaging in this sort of thinking and posture are unable to, now that it has been shown beyond doubt that is complete total bollocks, review their own beliefs, behaviour and ideas in light of it. Instead they just blame everybody else like self-deluded simpletons.
There aren't 2 major sides in the US, there are 3.
The 3rd side never does any formal campaigning (though there is some grassroots self-organised spreading of its message), often wins as it did this time and yet never controls any power because of how the electoral system works.
One might call the 3rd side the Not Voting Party.
The entire Democrats campaign was negative campaigning against the Republican Party, something which did nothing to take "votes" from the Not Voting Party and then specifically on Palestine, their actions, whilst if one judges them relative to the Republican Party were neutral, very strongly helped the Not Voting Party whose appeal on this was that a "vote" for Not Voting is a vote that doesn't support mass murder of children.
So if you look at it as a 3-sided contest, suddently the Democrat result is easilly explainable: they didn't as much lost to the Republicans as they lost to the Not Voting Party, and in that loss Palestine probably weighed heavilly, both because the Democrats broke some pretty strong principles for a lot of people (there aren't much strongers principles than being against the mass murder of children) thus convincing them to go "Not Voting" and because they, while raging about how Trump was a Fascist, were activelly supporting ethno-Fascists in Israel (the worst kind of Fascism there is) in the middle of a Genocide, they looked like evil hypocrites and weakened their only message trying to capture votes from Not Voting - the whole "Not voting at all is like voting for a Fascist" thing: calling the other guy evil and dangerous hardly helps convince the unconvinced when the people saying it are active supporters of an extremelly violent ethno-Fascism that has already killed thousands of babies and tens of thousands of children.