There is a quasi-religious aspect to this as far as the belief system of the adherents go. Logic doesn't come into it and they simply ignore what others would consider to be compelling points.
One of the worst is an american called Russ Tanner who runs globalskywatch.com
Tanner is a true believer who calls pilots who challenge him liars, even though he has no aviation or met expertise. He claims to be able to smell the chemicals after the "spray" has happened. His followers on his FB page are becoming more virulent in their posts. They are now actively discussing ways to bring down aircraft.
https://www.facebook.com/groups/glob...2731325025302/
https://www.facebook.com/photo.php?f...type=1&theater