Some outsiders are insiders
While many Catholics refuse, or are unable, to see why contraception is evil and ultimately destructive to humanity, good pagans often see what's at stake very clearly:
Before the advent of the birth-control pill, sex and procreation had been eternally, inseparably linked. After it, the link was pretty much optional. Momentous things ensued: chiefly women's liberation and the abortion controversy, all of them arguably the pill's indirect consequences, all of them reverberating to this day.