If you define purity culture as sexual abstinence before marriage, modesty in dress and conduct, and strict, distinct roles for men and women, then I would support it. The idea is to keep desire within the bounds of a permanent, committed relationship and to avoid the instability that comes from casual encounters. It is easy to imagine how this could work well if followed, but in reality, it rarely is. Few people live by it fully, and even among those who claim to, there is often quiet hypocrisy. Churchgoers and the most vocal defenders of "values" are not immune to breaking their own rules in private. In this way, it is one of those ideals more often praised than practiced. Even so, I think the principle is sound. A society that valued restraint, upheld modesty, and recognized clear sex roles would avoid much of the disorder and restlessness common today.