Hahaha, I am very glad that @builderofcastles (destroyer of reason) has brought your attention to me, for the reason that I am now following someone who has a lovely way of illustrating their points :-)
You are right of course, however I do think there is hope for a lot of these guys, they do genuinely believe, and so as long as they're not to far gone, they can be dissuaded from their errant beliefs.
Ultimately it comes down to the fact that with the internet, bullshit can spread much faster than before. So these beliefs are not harmless, as if enough people believe something, it becomes a fact, one which others repeat and teach to their children.
This is why I used the island analogy, so I don't see it as a waste of time, as these aren't directed at the hardcore fanatics, more so at the ones who are thinking, hmm, maybe there's something to this flat earth malarkey.
Anyways, I thought you might like my latest satirical look at the whole thing, here I explore just how many people would need to be in on such a conspiracy to have even the remotest chance of keeping this unfathomable secret.
https://steemit.com/flatearth/@cryptogee/flat-earth-is-real-the-confessions-of-a-new-age-physicist
Indeed I did. In the atheist community, we understand one of the best ways to deal with proponents of ridiculously beliefs is to merely laugh at them. To treat them with any seriousness wastes our time and gives them way too much credit.