An interesting video, but it’s very hard to talk to science deniers who are religiously motivated. (Will you try to talk your pastor out of his YEC beliefs?) One of the dead people featured on SorryAntivaxxers was a fellow who was an antivaxxer, a 9/11 denier, and a flat-earther. Even if he were still alive, how do you deal with that kind of person?
Also, in the case of climate change denial, a lot of those people don’t want to face the implications involved. They know facing the facts might involve more regulations, lifestyle changes, and higher prices for some things. Why not push it off and let the next generation deal with the coming disaster?