I think his point is that we should protect them from persecution.
I think he means a bit more than that. He means also that same-sex couples should enjoys some legal rights that help protect them as a couple (social security, disability, and medicare benefits; insurance plan incorporation; visiting rights in hospital or prison; protection against having to testify against your spouse; automatic entitlement to support if divorced; etc.)
Of course, none of this touches the sacramental definition of marriage that the Church proposes.