Mimesis is one side of a coin, it seems like contrarian tendency is the other. They both involve you making a little theory-of-mind for each of your friends/enemies/associates. To the point, it disturbs you that people are malleable and/or unreasonable, but why do you care at all?
I just wondered. Because you are a rando on the internet, and I constructed a model of your mind, and I don't quite understand it.
I care because, as a rational agent (or at least someone who aims to be), group-think affects me negatively when the group develops a dominant ideology which risks to infringe on my personal rights or take away opportunities from me sooner or later. I also believe that these dominant ideologies are harmful to the group and most of its honest/rational members.
It's important that members of the group keep an open mind so that the group doesn't become dogmatic. That's why I try to make contrarian arguments.
Blind copying is highly adaptive behavior and is the engine of human culture. Inventing things and reasoning correctly is really difficult, and copying widely adopted behaviors is usually much safer and more efficient.
Reading 'Not by Genes alone' really changed my perspective on this and helped me understand the blind copying as a very successful heuristic that sometimes gets things wrong.
It makes no sense to me why someone would spend so much energy and invest so much of their ego into an idea which not only they didn't come up with but which they haven't even bothered to analyze from first principles.
It disturbs me that people can be at once so malleable to the will of authority figures and yet so rigid and stubbornly resistant to basic reasoning.