I think people should have the legal right to hurt themselves without fearing that they're going to get locked up for doing so. But on a personal level if someone I loved was hurting himself or herself in front of me I would of course try to restrain them.
I don't know of many evangelicals who want to deny gay couples their legal rights. However most of us don't want to call it marriage because we think that word has religious connotations and we're not ready to see it used in ways that offend us.
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I'm coming out with my line of shoes and my very first shoe is called 'The Nethia.' How we came up with the name is that my legal name is Linnethia and we shortened it.