I think the major reason that people don't want to believe that personality is mutable is because they conflate personality with "Self." The idea that one's personality is mutable over time and in different situations thus attacks their concept of self, resulting in the sensation of ego-death. This is a terrifying concept to individualist dualist westerners, because they cannot shift their sense of self away from personality and behavior to other things like their body, their relationships, their community or their environment. To that mindset, becoming "Someone different" is a form of death.
Ben comments over email:
I tend to think of personality as a result of how a person interacts with the world. In some fundamental way, it's an adaptive response to the environment. So, I think the problem with a lot of people who think of their personalities as fixed, or get obsessed with personality typing, is that they have not interacted much with the world and as such they actually haven't crafted much of a personality. So they put the cart before the horse and latch on to some externally provided sense of self.
For older people, I think there is a fear of externally challenging themselves, which I think is a requisite of personality change. On top of that, there is probably dread over an awareness of the opportunity costs they have incurred by not considering other possibilities for their lives.
This reminds me of one of my favorite mental exercises, the "not that" meditation. Ask yourself, "Who am I?" And no matter what your answer, say "not that" and ask again. The point is not to get a final answer, but to cultivate a sense of who you are that's less like a fortress and more like a surfer.
]]>]]>In many ways the return to a simpler life about survival in a hostile environment, is a fantasy about how to remedy alienation. The feeling of hating one's job and doing it only for the money has never been as prevalent as it is now. Even fifty years ago when many jobs appeared worse, people took a certain pride in them. Today most workers feel like their job is absolutely pointless. That's what they would like to overcome, but they don't know how, so the outlet is an apocalyptic fantasy promising the return to human nature. Imagine living as an animal, or in an ancient tribe instead, as a very natural life where issues like depression don't come up the way they do in our developed way of life.