Webster’s definition of “institution” includes the following:
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a. A custom, practice, relationship, or behavioral pattern of importance in the life of a community or society: the institutions of marriage and the family.
b. An established organization or foundation, especially one dedicated to education, public service, or culture.
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These definitions are very different. In the latter case, an institution is a finite entity, like a government or school, and anything which affects one significant aspect of it affects the entire institution and everyone connected to it. Like if the building falls in, or the money runs out, or drug use becomes a big fad within the walls, or the leadership becomes incapacitated. But with the “behavioral pattern” type of institution there are no walls, no budget, no leaders, no membership rolls. What we do have are infinite “copies” of a particular model that the overwhelming majority of the population are inclined to emulate. It would be less misleading to say that there are hundreds of millions of institutions of marriage, not just one.
The dictionary uses marriage as it’s example of the first type of instituion, and “protecting” the institution of marriage has become a major issue in respionse to the possiblility of the recognition of gay mariages. This raises the question, what other institutions are there like this? Is, say, music an institution? If we allow certain kinds of music to be played, say some unconventional tuning or time scheme, will that harm all of those for whom music is a part of their lives? Or will it simply appeal to a narrow audience who are so inclined to listen, while most people continue to prefer more convertional tunes?
Indeed it is inclinations and their impact on society when allowed free rein that social mores are designed to control. Simply put, is same-sex marriage a preferable alternative to opposite-sex marriage for most people so much so that we’ll suffer a shortage of children?
Polygamy is always thrown into the gay marriage debate as a total red herring. But there are subtantive, secular reasons to ban polygamy. A society based on polygamy incorperates fundamental inequalities in a number of ways. And while most people in the US would currently prefer the standard monogamous arrangement, polygamy-based subcultures exist and more would emerge. The potential is there for a return to universal polygamous values because there is indeed a natural human inclination for powerful men to get all the women (so much for basing sexual morality on what’s “natural”).
But because homsexuality is confined to a certain limited percentage of society, legalizing gay marriage would simply have no effect on the culture at large. Any claim to the contrary requires magical thinking.