Today someone was wrong on the internet. Yesterday someone else was. Actually a lot of people were wrong on the internet, and why does that bother us? I think we get bothered because we feel deep down that what we are doing/thinking/saying is right. If we didn’t we wouldn’t be doing/thinking/saying that. Then we take that one step further and assume that because someone else does/thinks/says similar things to us on topic A that they will do the same for topic B.
The daily show had a great bit a few weeks ago where the corespondent expressed shock that it was left leaning people primarily in the “anti-vaccination” movement. The idea that someone who agrees with us can also disagree with us shouldn’t be a surprise, and yet it is. In any large religion there are as many viewpoints as there are believers. And some of those viewpoints are opposite each other. And some of those opposite viewpoints are over key tenets of the religion. Yet both are considered part of the region. Similarly two people can have very similar views on child rearing but completely opposing views on the environment, or labour laws, or the advantages of ketchup or ranch as a condiment.