What high-openness liberals feel as mere nostalgia, low-openness conservatives feel as the baseline emotional tone of a recognizably decent life. If your kids don’t experience the same meaningful things in the same same way that you experienced them, then it may seem that their lives will be deprived of meaning, which would be tragic. And even if you’re able to see that your kids will find plenty of meaning, but in different things and in different ways, you might well worry about the possibility of ever really understanding and relating to them. The inability to bond over profound common experience would itself constitute a grave loss of meaning for both generations. So when the culture redefines a major life milestone, such as marriage, it trivializes one’s own milestone experience by imbuing it was a sense of contingency, threatens to deprive one’s children of the same experience, and thus threatens to make the generations strangers to one another. And what kind of monster would want that?