I'm with you on that too, it's just that I would see addressing the crackpots claims as the solution. Or just laughing and handing them a pushcard that has 'top 100 stupid claims against our society that appear fully debunked for all time and where to go if you think you have a bug report to our foundational understandings (you probably don't).'

What happens instead, is people get afraid that the crackpot will be believed, and then the idea will spread, and then it will become a movement, and then the movement will take political action, and then they will form a lobby, and then they will take seats in government, and then they will enact policies, and then they will harm people. Delusional fears of what could be that are then manifested into reality rather than dealt with by the person who has... delusional fear.

Dude, it's just a crackpot. Let the guy talk and allow those who have a natural instinct to guide him away from his illogical perusings to do so.