Bit of a stretch ... but that’s the best answer so far.
SnakeDoc
I haven’t read Reagan’s thoughts on the subject but here’s another way it leads to murder.
Gay marriage leads to increased acceptance of homosexual behavior, which leads to an increase in the incidence of pedophilia, and then the reconsideration of pedophilia from a medical/psychiatric disorder to a tolerable “difference.” More pedophiles, more child rapes, more deaths.