Thank God there is another way to slow down the exploding white population in the West.
Experience seems to show that NFP couples end up having more kids anyway, because over the years, they end up wanting more kids.
It certainly allows for choosing to optimize reproductive success across the fertile years --- unlike, say, sterilization.
It's actually a plot. Couples who use NFP think about babies a lot, because of all the info-collecting. The result is that they have more babies than other people. They're just more happy about it, and rarely surprised.
It's a sneaky, pro-Western fertility device.