The democratic presidential campaign in 16 and 24 amounted to: you should vote for us because the other guy sucks...It didn't work in '16, there was ZERO reason to think it would work in '24, but fuck it, we can always blame the voters.
It wasn't just the same strategy. It was a lot of the same people who worked on Hillary's campaign, as well a bunch of Obama flunkies pushing the, "demographics are destiny," narrative that keeps convincing the party they can safely ignore the working class and focus on, "moderate," Republicans. A bunch or them went on Pod Save America to explain what happened with the Harris Campaign, and (Spoiler Alert) turns out they did everything right, the campaign was great, and everything that went wrong was someone else's fault.
Anyway, I'm sure the OP is right, and the protest voters are why she lost. It's definitely not the fault of the Democratic Party elites who keep re-hiring the same strategist despite their catastrophic failures. I'm gonna get a head start on making memes blaming the left for Hillary's 2028 loss to Trump because no one learns anything and we live in hell.