Wait. Hold on. Are you blaming marginalized groups for inventing language to describe their marginalization? And then talking about it?

Nope.

I am blaming any of them them, and/or their allies, who seemingly think / thought that that alone would be sufficient to stop fascism.

This is an immensely naive way of thinking.

You know, like how democracy is supposed to work, where you 'promote discussion' about a problem until you've convinced a critical mass of voters that there is a problem and they need to vote for policies that fix it?

The entire strategy of fascists is to pervert how democracy is "supposed to work", thus revealing the state as its true nature, a monopoly on 'legitimate' violent force, that can be made to do nearly anything with that force, once it is fully perverted.

Is the implication here that fascists, these experts at manipulating language in dishonest ways, would be helpless if they didn't have new words from marginalized groups to pervert?

No, the implication is that you can't fight fascists with words alone and win, you have to be able to credibly match the power and force they wield, by more clever means, than just talking at or about them.

You have to cut off their funding, you have to jail them for their crimes, you have to actually present a workable solution to the the economic plight of people who are likely to become fascists (conservatives), you have to address that the root cause of fascism is the decay of a corrupt capitalist democracy, and by 'address', I again mean with actual actions, actual policy changes, or extragovernmental means like a mutual aid group.

Because I doubt fascists have any problems with attacking the people they hate, whether those people make up new terms or not, or, for that matter, whether those people talk about their marginalization or stay quiet to try and avoid fascist attacks.

They don't, but fascism is largely a cancer that grows, much more so than it is some kind of innate, unchangeable aspect of... well at least most people.

So, the cure is to start at the root and treat the causes of the problem, comprehensively.

Don't do that?

Sorry, but historically, then the fascists win, untill some later war or mass armed rebellion or resistance basically kills or jails them all, and then also literally sends them to reeducation camps.

(EDIT: Well, maybe not literally 'reeducation camps', physically isolated camps, but at least some kind of comprehensive, compulsory, de-fascizing, reeducation system)

I am not trying to say the burden of stopping fascism lies squarely on the shoulders of those most likely to be persecuted by fascists.

I am saying that any of such people (myself included) who believe that ... just raising awareness and promoting discussion alone, for its own sake, as the ends instead of means to a more actually useful ends...

Anyone who believes that alone will work is a fool.

Again, because this is what history shows us.