It sort of reminds me of something we learnt in teaching. To have someone accept a new theory or perception, they need to invalidate the way they used to look at it, or at least see enough flaws in the old way that they search for a replacement. For example if someone believes the world is flat and nothing you say unsettles that belief, they are unlikely to learn from you that the world is round. In a similar way, if people have faith in their current ways, find comfort in them, find them rewarding, etc. then they are unlikely to see a need to replace them with something new, no matter how well you sell it or believe in it. If they suddenly see their ways in a far more negative light that invalidates them, then they might change (eg. Scrooge ). I think anyone can change, just it is easier for some than others, depending how entrenched they are in a certain way, and maybe what society will allow them to change to from that.