This could have saved or eased the suffering of those who lost their entire life savings on assets that crashed in the recent bear.
I agree. And make no mistake, DCA is a great investment approach people could adopt. It is recommended. However, this won't really pacify those who have panicked and those who have fallen to their fear and eventually decided to sell what they have. In other words, this only applies to those who know what they are into. To those who do not, the various kinds of investment approach do not matter, especially when faced with a severe bear market.
So what will really ease their suffering and save them from making worse decisions is education and awareness.