The answer to anyone who points out that none of their allegations make any sense, that there is no evidence of any of this is, “Well, where is the evidence that it’s not true?”'
A lot of people can't comprehend this logical fallacy: you can't prove a negative!
To help these no-conspiracy-is-too-absurd-to believe' people to understand, one of them the son of Michael Flynn, soon to be US national security advisor who said 'until pizzagate proven to be false, it'll remain a story' (https://www.washingtonpost.com/news/the-fix/wp/2016/12/05/did-michael-flynn-really-tweet-something-about-pizzagate-not-exactly/?utm_term=.886ee45a351a), I will say to him: until there is evidence that you have not killed anybody, it will remain a story.
In this insane World, there isn't much you can do other than throwing it back at them - still I am not sure they will come to their senses.