So what’s up with denying entry to that French scientist who was only in the US for a conference because of his posts criticizing Trump on the internet? North Korea seen as the model for how they want to shape US

No worries, by the way I found out you can filter posts by keyword just not on the default Lemmy interface but in some apps such as: Voyager, Connect, Sync, Summit, Mlem, Boost, Eternity, Thunder, Arctic and on web interfaces Tesseract and Voyager. Lemmy.world has m.lemmy.world where you might be able to use Lemmy with keyword filters

If you go to PieFed afaik you can filter posts by keywords and you even get asked if you want to see no posfs related to him or Muskolini, no need to troll downvote posts