Why do some libertarians argue that government should not regulate marriage?

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Some libertarians argue that the government should not regulate marriage because they believe that state powers should be strictly limited to essential tasks such as maintaining civil order, infrastructure, and defense.1

From this perspective, marriage legislation—whether it involves the legalization or the prohibition of same-sex marriage—falls outside the proper scope of government authority. Consequently, many libertarians advocate for the "privatization" of marriage, meaning it should be removed from government regulation entirely, allowing citizens the freedom to form any partnerships of their choosing.1