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Emotions are a powerful influence on belief. I have a bit of wisdom on this, but it requires an analogy that may be hard to understand. Every now and then I'll go on a workout spree to lose some extra baggage I've accumulated over the previous few months. The only way it works, along with a diet, is if you have complete commitment. I never cheat once, never take one single break, etc. To do this, I put myself in a certain state of mind where my thinking grows cold and absolute, resolute. It's hard to render what I do into words.
This is the state of mind I use when I find myself thinking of things from a biased perspective when I think deeply. Not all the time, but mostly when I find I'm being biased or not covering all the logical bases on both sides of the debate. It's an interesting thing, how when you try to consider things from the oppositional perspective, you still are only doing so to further reinforce your current perspective. This is only an illusory way of being fair to both sides, and isn't truly fair. To be truly fair, you have to be absolute, resolute, and actually become a proponent of the oppositional perspective. This is the only way to be without a little voice talking in the back door of your brain about how you can use your current thoughts to support your long held stance(whatever that may be).
Most people have strong opinions on many different things, which is to say they have an emotional involvement in the subject. I think most claims of objectivity for such people on those subjects are illusory. To have a truly objective stance is very difficult, and requires quelling any and all emotional attachments to the subject you're currently discussing or thinking. There's no other way to perceive the side of the opposition with clarity.