(Unfortunately, Reply-Grok may have been successfully partially lobotomized for the long term, now. At the time of writing, if you ask grok.com about the 2020 election it says Biden won and Trump's fraud claims are not substantiated and have no merit. If you @grok in a tweet it now says Trump's claims of fraud have significant merit, when previously it did not. Over the past few days I've seen it place way too much charity in right-wing framings in other instances, as well.)
It feels like we've reached Peak Stupidity but it's clear it can (and likely will) get much worse with AI videos.
Most people who believe bullshit were convinced by something. It might not have been fully rational but there is usually a kernel of something there that triggered that belief. They also probably have heard at least the surface level version of the oppising argument at some point before. Too many debunkers just reiterate the surface argument without engaging with whatever is convincing their opponent. Then when it doesn't land they complain their opponent is brainwashed. Which sometimes might even be true, but sometimes their argument just misses the point of why their opponent believes what they do.
Fox (and others like it) offer 24/7 propaganda based on fear and anger, repeating lies ad nauseam. It's highly effective -- I've seen the results first-had.
Making ad hominem attacks against "debunkers" doesn't make your case.
And again, trying to change people's minds by telling them what they believe is wrong is a fools errand (99.99% of the time). But it still needs to happen as that misinformation should not go unchallenged.
It's a trite point and I ended up repeating it before seeing your post but this really is very true even if it may not seem like it. On one hand the practice is basically futile. But someone absolutely needs to do it. People need to do it. The ecosystem can't only ever contain the false narratives, because that leads to an even worse situation. "Here's why Holocaust denialism is incorrect and why the 271k number is wrong" is essentially pointless, per Sartre, but it's better for neo-Nazis to be exposed to that rather than "one should never even humor Holocaust denialists".