2 The Church recognizes that these media, if properly utilized, can be of great service to mankind, since they greatly contribute to men's entertainment and instruction as well as to the spread and support of the Kingdom of God. The Church recognizes, too, that men can employ these media contrary to the plan of the Creator and to their own loss. Indeed, the Church experiences maternal grief at the harm all too often done to society by their evil use. Hence, this sacred Synod, attentive to the watchful concern manifested by the Supreme Pontiffs and Bishops in a matter of such great importance, judges it to be its duty to treat of the principal questions linked with the media of social communication. It trusts, moreover, that the teaching and regulations it thus sets forth will serve to promote, not only the eternal welfare of Christians, but also the progress of all mankind.
Source: Inter Mirifica (Vatican.va)