One thought, though: the major reason why gay "marriage" went from three out of every five Americans to opposing it to a small majority favoring it is that not only were we inundated with emotional propaganda about how an institution that had always been about children really being about "love" and how a radical redefinition of the institution of marriage was actually nothing but achieving "equality," but those who tried to make the opposite case were bullied, persecuted, harassed, slandered, and fired from their jobs.
And silenced. Hard to have a debate when only one side is allowed to be heard.
Kind of hard to fight that sort of thing. We need to develop a strategy for dealing with that, above all.