Setting their posts to invisible is not the best solution. After all, if you know to not be roped in by their manipulation then they're powerless against you whether you see them or not. But there are people who don't realize what these posters are doing. At best, these comments ought to be downvoted so that it's hard for people to see them and hence get duped. Second best is that these comments need responses with real information calling out their bullshit. Trump supporters this late in the game are lost causes, but there are still people who don't follow the news at all and rely on the internet shoutbox to learn how the world works. It's a bummer, but I think fighting against this garbage has to become a bit less passive and a bit more active.