He's wrong. Culture isn't only about "immediate reaction". It's about a culture that develops around the norms, customs, laws, etc.
Olsen is endorsing a real war on women and children, the protected class in the institution of marriage. We already see them impoverished through out-of-wedlock births.
MARRIAGE becomes irrelevant in a polygamous, homosexual (even bestial?) culture.
Culture itself is dependent on its morality, and a culture without God is a culture where no one is accountable. How do you hold a welfare check baby-daddy accountable? You're already paying for him.
So, homosexual marriage deconstructs our current 'nuclear family' culture and replaces it with a 'homosexual' culture or a 'random relationship' culture.
A true war on women and children.
“MARRIAGE becomes irrelevant ...”
Unfortunately, marriage has been becoming more and more irrelevant over time for a long period. People get married as an option these days, many with the idea “I’ll give this a try”. The ‘until death do us part’ thing isn’t really relevant anymore.