How do you deal with those that are convinced the end of the world is near?
I have a well-off relative who spent on a whole bookshelf of Christian books on the end times. She gathered the family on Thanksgiving to tell us China is in the bible, and the current wars in the Middle East are signs that the final Armagedon will soon happen in Israel. It's not enough for her to be special because she is a true Christian who will dwell in heaven. In her mind she lives as one of the last humans of all time.
Some of these people buy canned food, water, or guns. Others stockpile gold like the Jehova Witness. They can't plan for a peaceful life because their mentality is stuck in survival mode.
I've also heard pastors saying they believed we lived at the end, and the local pastor offered bible studies on Revelation every Wednesday for nearly six months, which gave my Grandmother nutty ideas. (I should have gone along for laughs.) The devout pupils of "armagedonology" dwell at 8chan too.
https://8ch.net/christ/res/2058.html