St. John Paul II wrote in his 2002 Apostolic Letter on the Rosary, Rosarium Virginis Mariae:
6. … A similar need for commitment and prayer arises in relation to another critical contemporary issue: the family, the primary cell of society, increasingly menaced by forces of disintegration on both the ideological and practical planes, so as to make us fear for the future of this fundamental and indispensable institution and, with it, for the future of society as a whole. The revival of the Rosary in Christian families, within the context of a broader pastoral ministry to the family, will be an effective aid to countering the devastating effects of this crisis typical of our age.
And don’t forget that the Rosary was prayed against the invasion of Islam.