What fascinates me is that everyone with a strongly held opinion had a point before they formed that opinion. Individual Flat Earthers once weren’t, Nazis once

What fascinates me is that everyone with a strongly held opinion had a point before they formed that opinion. Individual Flat Earthers once weren’t, Nazis once weren’t, and so on for the rest of us. Is there research on that point of opinion formation? Does it tend to happen, say, before a certain age, or at a point of emotional vulnerability, or following a major life transition?