When the Marriage Equality Referendum happened in Ireland, the No arguments came down to some variation of "think of the children". They talked about surrogacy (I agree there are ethical issues with commercial surrogacy, but most people using surrogates are hetero couples). Or they talked about adoption without mentioning that adoption is currently rare in Ireland (there were something like 5 babies and 25 foster children adopted by non-relatives in the year before the referendum; I'm told Australia has equivalent numbers) and the process for adoptive parents is tortuously thorough.
The Yes campaign also concentrated on family -- but in a more positive way. It was all about "gay people are our siblings, parents, aunts, uncles, etc. so let's not stand in the way of making them happy". There was an effort to get young people to vote, and also to reach out to older people who might have doubts (e.g. https://www.irishtimes.com/news/soc...make-video-urging-marriage-equality-1.2132252).
Now we have a gay Prime Minister, and most people are less concerned by his sexuality than his political policies (oddly enough, he's one of the most right-wing leaders we've have for years).
The Yes campaign also concentrated on family -- but in a more positive way. It was all about "gay people are our siblings, parents, aunts, uncles, etc. so let's not stand in the way of making them happy". There was an effort to get young people to vote, and also to reach out to older people who might have doubts (e.g. https://www.irishtimes.com/news/soc...make-video-urging-marriage-equality-1.2132252).
Now we have a gay Prime Minister, and most people are less concerned by his sexuality than his political policies (oddly enough, he's one of the most right-wing leaders we've have for years).