I like the overall theme of the post. I agree that we are easily fooled by what soceity deems "correct" and fear of breaking these moulds that they place for us. However, I do not believe authorities create polarisation in society. I believe it is human nature to distrust things that are foreign to them. When we roamed the plains of Africa, homo sapiens stepped with caution. We see this caution today not only in race relations but also in the trivial, say a new website layout or a grocery store rearranging their isles. What WE as humans, need to do is constantly put ourselves in situations that go beyond our comfort zone. Make an active effort to learn about other people, and to expect the unexpected.
tl;dr Polarisation occurs from our natural response of caution. We must constantly work to accept uncertainty and differences in our world.