I think his point is that we should protect them from persecution. If being a sinner means we allow them to be persecuted, then we all should be persecuted. No one deserves persecution, even for something that is wrong. A wrong does not justify another wrong. I agree that we should do something actively to protect gays from persecution. This doesn't mean we will marry them or fight for redefining marriage. We believe all are created in the image and likeness of God, therefore we should fight for their right to be free from persecution.