Some people are very risk-averse; long ago I put together a spreadsheet to calculate what we needed to save for retirement, and being a good engineer type put in adjustments for inflation, investment return, etc. This was before any online resources existed to check these things. My DW immediately wanted me to check what our savings rate would have to be for conditions of 10% inflation, which she had seen in her lifetime, and 2% returns (not real returns, total returns, so -8% on your money each year), which she had also seen, for all time including retirement. This assumption, of course, gave staggeringly high savings rates needed for any kind of even vaguely early retirement rate.
So if someone doesn't trust or understand the much more sophisticated analysis done by the like of Kitces, like my friends who saw their 401k drop from 700k to below 200k in 2009, and say it still hasn't recovered over 200k (!!!), and didn't know then or now what it was invested in, even categories, like stocks vs. bonds, the market is a Scary and Dangerous Place. . .