" If the argument were true, wouldn't that have already happened in countries where forms of legalized gay marriage already exist?" This is a spurious argument. The gay rights movement has been doing its thing for decades now, while groups who promote pedophilia and incest are still fringe groups today. Which just begs the question. What guarantee can anyone give that these fringe elemtns won't become mainstream some day in the future? Netherlands supposedly has a pedophile political party now.