Second, and probably most importantly, it's tactically wrong. "No point discussing political opposition to fascism, there won't be elections anyway" cedes victory to your enemies. It's defeatism and nihilism.

Finally, it's wrong AS A MATTER OF ETIQUETTE. Entering a total stranger's discussion and leading with your private anxiety is as off-putting in social media replies as it would be in real life. If you wouldn't interrupt a stranger at a party to announce that America is doomed, don't do it here.