Mary Eberstadt, in an article in First Things, makes her case drawing from the empirical stats admitted even by the Church’s enemies. Here’s a clip.
Eberstadt provides numerous examples of secular researchers who have followed the data, vindicating each and every one of Paul VI’s four primary predictions about the consequences of contraception: “a general lowering of moral standards throughout society; a rise in infidelity; a lessening of respect for women by men; and the coercive use of reproductive technologies by governments.” Full article here.