Help?

An image has entered my thoughts. A married couple live happily together. They are very much in love and have been since they met many years ago. They are hardly separable to their acquaintances in their mannerisms and points of view, likely because they have spent much of their life growing up together and exposing themselves to the same cultural and social influences. However, they vote differently. One votes ardently Republican, the other Democratic. One votes ardently Conservative, the other Labour. Delete as appropriate. Why, therefore, should either one of them vote? They merely cancel one another. They are mutually exclusive. The negate the other. And still, both feel compelled to do so. Why would this be? Expression? They both accept and encourage the other's right to opinion. Why not stay at home and enjoy a warm cup of tea, safe in the knowledge that, once again, their differences have brought them together? Perhaps they are reminded that roughly 95% of those who vote will merely negate each other also. Perhaps this compels them to cast a vote; their individual vote is not offset by their partner's, but by someone else's. What a strange, and yet typical conundrum this couple find themselves in.