Warning - The earth is flat and dinosaurs never existed

Why...
Am I fascinated by life’s Don Quixotes, hopelessly charging at windmills. My son, (a certified commercial pilot) was accosted recently by someone trying to persuade him the Earth is flat, Australia does not exist and vapour trails are really chemical sprays created by NASA to fry our minds..... If you are bored, whiling away ten minutes with the terminally loopy is quite fun. Never try and disagree. Arguing with the terminally deluded is pointless. Much more fun is to appear shocked and ask for more details. I am simply amazed at the pigheaded resilience these theorists can display with the information now available, which so easily punctures their balloon. A quick trail of the internet on conspiracy theories is only really disturbing when you realise these people can vote.