A few things.

Firstly, we can dismiss the notion that the candidate can't be moved. The citation for that is Biden in 2020, who effectively campaigned during the primary as a moderate Republican, and until the southern states which we're never going to go blue anyways weighed in, was getting his ass handed to him. The Sunday before Super Tuesday, the rat-fuckening, Oblivious Warren. All that old history.

And then something remarkable happened. Biden opened the doors to the tent and invited the progressive wing of the party in. He handed the Bernie-crats the platform and said "have at it hoss". And it worked. Instead of disenfranchising the activist base, he embraced them, or at least, extended an olive branch by giving them the platform, without which he assuredly would have lost.

So: Candidates can be moved.

Second:

By the Presidential election, it’s already years too late to force them to actually do good things. Protest votes and withholding your vote have done nothing to stop the slide that led to Harris campaigning with Liz Cheney in tow in the 16 years that I’ve been voting.

Again. And I'm singling you out because you responded and well, here we are. This is an obtuse, bordering on bad faith interpretation of the argument being made. You aren't arguing with me. You are arguing with the millions of voters who stayed home for Kamala but showed up for Biden. And you moralizing about an objectively misguided application of strategic voting didn't/ doesn't/ won't/ change their votes. When your "strategic voting" strategy results in losing you the election, explain to me how and why its strategic?

You don't/ can't move millions of voters to a new position. Or at least it hasn't been shown to be possible (2016, 2024). Asking voters to "vote against" instead of "voting for" doesn't work and we now have so many receipts, that they will write text books on the matter. What can be done, is that the candidate can be moved. Its also been shown through an evidentiary process to work.

To summarize, candidates can be moved. Biden moved and won an election because of it. When you moralize about your own, demonstrated-to-be-wrong conception of strategic voting, you aren't arguing with me, you are arguing with the literally millions of people left on the table by the Democrats. A strategy that when examined before hand will clearly lose, the insistence of then implementing it becomes a "burn the world down" moralization to wash your own hands: Democratic voters who reliably show up, but did not, because the DNC got a hall pass from those making the exact arguments you are making here. They did not need to respond to criticism because this argument you are making shielded them. And it cost us all, practically everything.