If you were purely logical and rational you would seek to diversify your information sources but people actually do the exact opposite. They go out of their way

If you were purely logical and rational you would seek to diversify your information sources but people actually do the exact opposite. They go out of their way to not be exposed to out-group information sources and will often violently oppose such sources. Even within the group dissenting voices are silenced. There is no logical or information theoretic perspective that justifies or explains conformance behavior. It's all pure biology.