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I think the family unit is an important enough institution that it's correct for it to have special status in legal and tax matters.
You're not really getting government out of marriage if you keep the various laws that give it special status (tax breaks etc) and let anyone sign a contract; you're just letting anyone sign themselves a tax break and hopefully it's obvious why that's a bad idea. To actually get the government out, you need to do away with all the perks that come with marriage today, and I think that's a bad idea because the two parent family is a good thing to incentivise.